Across:
8 All that remains (FOSSIL) of a type of aluminium material (aluminium foil = FO- IL) wrapped around ship (-SS-) (FOSSIL),
9 Turns up (= reverse indicator), university (-U-) in, for example (e.g. = -G-E), Oxford (-O-) put down (laid = DIAL-) (DIALOGUE) conversation between a number of people (DIALOGUE),
10 A large number (BEVY) of orators coming out of observatory (‘orators’ coming out of ‘observatory’ = bevy = BEVY).
11 Huge regret (huge regret) misbehaving (= anagram indicator) (huge regret = TREE-HUGGER) with one of The Greens embracing the elders (TREE-HUGGER),
12 Light up the match (STRIKE a match) for club (club/beat = STRIKE),
14 Keep under control (RESTRAIN) producing Cross (= anagram indicator) Trainers (trainers = RESTRAIN),
15 Don’t expect a comeback after reaching this (POINT OF NO RETURN) with ace (ace in tennis is a POINT OF NO RETURN),
18 Not ignorant (LITERATE) of elite art (elite art) movement (= anagram indicator) (elite art = LITERATE),
20 Pick up local (pick up ‘locally’ = ARREST) American (A-) charger from the foundation (‘chargeR’ from the foundation = -R-) to recharge one’s batteries (-REST) (ARREST),
22 Detective (DI-) bugs (taps = -SPAT-) revolutionary (= reverse indicator) to get revolutionary’s (Che’s = -CHES) (DISPATCHES) communications (DISPATCHES),
24 On top of everything else (HEAD), dispatcher loses script (‘dispatcher’ loses ‘script’ = dahe = HEAD),
25 They accommodate those going to war with (BARRACKS) with drinking establishment (BAR-) set up by sommelier in The Cellar (wine -RACKS) (BARRACKS),
26 Responsibilities (DUTIES) for documentaries lacking romance (‘documentaries’ lacking = ‘romance’ = duetis = DUTIES).
Down:
1 Frank (HONEST), Henry (H-), Oscar (-O-) and Old Bob ('old bob' = shilling = -S-) dividing land in fishy way (land a fish/net a fish = -(-NE-T)? (HONEST),
2 Lift out of self-pity (‘lift’ out of ‘self-pity’ = sepy = ESPY) for notice (ESPY),
3 Everyone (ALL) starts to harden (starts ‘To Harden’ = TH-) self-image (self-image = ego = -E GO) (ALL THE GO) in Vogue (ALL THE GO),
4 It’s not working (IDLE) in Donegal (-DL-) in Ireland (Ireland domain .ie = -I-E) (IDLE),
5 Secret stores (CACHES) of E-cash (E cash = CA-HES) distributed (= anagram indicator) around Cork (-C-) (CACHES),
6 Dance partner (SONG- and dance) is a bookmaker (-WRITER) (SONGWRITER) who does his work in bars perhaps? (SONGWRITER writes in bars/beats),
7 Is it better (SUPERIOR) to rise up or (rise up or) run? (= anagram indicator) (rise up or = SUPERIOR),
13 Popular (in) sound (= homophone indicator) (‘in’ = ‘inn’ = INN-) footballers (-KEEPERS)? (INNKEEPERS) Those producing the shots! (INNKEEPERS),
14 Soldier (ranger) isn’t finished (r) (‘ranger’ without ‘r’ = RANGE) with compass (RANGE),
16 The first (ORIGINAL) Generalissimo seems out of it? (‘Generalissimo’ seems out of it/without ‘seems’ = gnraliio = ORIGINAL),
17 One of the courses (ROAD-) with fries (-SIDE) (ROADSIDE), by the way? (ROADSIDE),
19 Worker (ANT-) in charge (in charge = -IC-) of Zoo’s ultimate (‘zooS’ ultimate = -S) (ANTICS) monkey business (ANTICS),
21 Model (SHAPE-) and director (-D) (SHAPED) in cast (SHAPED),
23 Sample of gazpachos tested (sample of ‘gazpacHOS Tested’ = HOST) by entertaining figure (HOST),
24 Unable to stomach (HATE) the extremes of hazardous waste (the extremes of ‘HAzardous wasTE’ = HATE).