Across:
8 Reveal (UNVEIL) organisation (United Nations = UN-) is evil (evil) agitator (= anagram indicator) (evil = -VEIL) (UNVEIL),
9 Brought to life (ANIMATED) by Edward (-TED) Fox, for example (animal), from the start (= position indicator), and not finished (l) (‘animal’ without ‘l’ = ANIMA-) (ANIMATED),
10 Part of revolutionary (= revere indicator) solution? No brainer (part of revolutionary ‘solutioN NO Brainer = nnob = BONN) for city on The Rhine! (BONN),
11 They’ll get you thinking (BRAIN CELLS) 26 across is for the most part (‘brains’ for the most part = BRAIN) accommodating those in the monastery (CELLS) (BRAIN CELLS),
12 Pressure (P-) to mysteriously (= anagram indicator) elope (elope = -EOPLE) (PEOPLE) with men and women (PEOPLE),
14 Making the most sense (BRAINIER) at the start of 11 across (start of ‘brain cells’ = BRAIN-) with royal (-R-) following (= position indicator) Ireland (.ie = -IE-)? (BRAINIER),
15 Recognises a good head on one’s shoulders presumably (BRAIN SPECIALIST) by opening 11 across (opening ‘brain cells’ = BRAIN) for unique (SPECIAL-) winner (1st = -IST) (BRAIN SPECIALIST),
18 Free partner (SCOT- free) to secure a contract (-LAND a contract) (SCOTLAND) for the country (SCOTLAND),
20 Grasped by one of those at death’s door (Grim Reaper / SCYTHE) with chesty (chesty) problem (= anagram indicator) (chesty = SCYTHE),
22 Short (e) profane (desecrate) (‘desecrate’ without ‘d’ = DESECRAT-) introduction to original (introduction to ‘Original’ = -O-) writing (-R) (DESECRATOR) by one being disrespectful to religious surroundings (DESECRATOR),
24 Caught up (= reverse indicator) in commercial aerodynamics (caught up in ‘commerciaL AERodynamics’ = laer = REAL) in South American capital (South American capital/money = Brazilian real = REAL),
25 Hold court (‘reign’ = ‘rain’ = -RAIN-) reading aloud (= homophone indicator) in Bed & Breakfast B&B = B-B-) with a beastly type (-OX) (BRAINBOX) of whizz-kid (BRAINBOX),
26 Minds (BRAINS) what’s found in 25 across (BRAINS found in ‘brainbox’).
Down:
1 Popular (IN -) comedian (joker) briefly (r) ('joker' without 'r' = -JOKE) (IN-JOKE) the subject of a gag among a small group (IN-JOKE),
2 Short (o) party locally (party ‘locally = ‘beano’ without ‘o’ = BEAN) for coffee producer (coffee BEAN),
3 Those taking steps (dancing steps) on a night out (CLUBBERS) to order (order/organisation/club = CLUB-) the odd beer (the odder letters in ‘BeEr’ = -BE-) going around Rhodes (going around ‘RhodeS’ = -RS) (CLUBBERS),
4 In part, somewhat adamant looking back (= reverse indicator) (in part ‘somewhAT ADamant’ looking back = atad = DATA) to what’s analysed by figureheads presumably? (DATA),
5 Lot missing from anti-novel (‘lot’ missing from ‘anti-novel’ = aninve = VIENNA) from European capital (VIENNA),
6 Patrick (PAT-) Ward (-ER-) is going to stand in Croke Park (-NALLY stand) (PATERNALLY) like any father would (PATERNALLY),
7 Headland (-NESS) behind (= position indicator) spring (WELL-) (WELLNESS) synonymous with good health (WELLNESS),
13 Eccentric (= anagram indicator) painted rim (painted rim = PRINT MEDIA) of press (PRINT MEDIA),
14 Side bar is missing (‘side bar’ ‘is’ missing/without ‘is’ = debar = BREAD) something to put the butter and marmalade on (BREAD)
16 Music (ROCK-) to have a go at (-TRY) after (= position indicator) closing time (closing ‘timE’ = -E-) (ROCKETRY) utilises science that’s bound to take off (ROCKETRY),
17 Popular (IN-) writer (-SCRIBE) (INSCRIBE) of score (score/etch = INSCRIBE),
19 Bacterium that needs oxygen (AEROBE) in Belgium (-BE) after (= position indicator) a country (Korea) with no leader (k) (‘Korea’ without ‘k’ = orea) goes belly up (= reverse indicator) (orea = AERO-) (AEROBE),
21 Even they care (even letters of ‘tHeY cArE’ = HYAE-) this has bearing (bearing North = -N-) on a (-A) (HYAENA) beastly sort, in an alternative sense (HYAENA / hyena),
23 Expert witness dismisses wine press (‘expert witness’ dismisses ‘wine press’ = extt = TEXT) in a written correspondence (TEXT),
24 Nearly (y) raring to go (ready) (‘ready’ without ‘y’ = READ) in study (READ).