Across:
8 Americans dismiss sin (‘Americans’ dismiss ‘sin’ = amerca = CAMERA) of film producer? (CAMERA),
9 Flying off the shelves (HOT -) with nuts (= anagram indicator), colas (colas = -COALS) (HOT COALS) and something to liven up the barbecue (HOT COALS),
10 Poses a question (ASKS) for most of those from 24 down (most of ‘task’ = ASK-) at school (-S) (ASKS),
11 What you’d expect from 12 across (what you’d expect from ‘priest’ = BLIND FAITH) is unquestioning devotion (BLIND FAITH),
12 Train (= anagram indicator) trips (trips = PRI-ST) around Spain (-E-) (PRIEST) with father figure (PRIEST),
14 A question of procedure (-HOW-) abandoned (-OFF-) in ship (S-S) (SHOW-OFFS) by posers (SHOW-OFFS),
15 Running (= anagram indicator), rowing (rowing = INGROW-) and adventure at centre (‘adventure’ at centre = -N) need to be cut back (TOENAILS) (INGROWN TOENAILS), as they can be a problem for pedestrians (INGROWN TOENAILS),
18 A (A-) path (-WAY) from the estate (GAME) (AWAY GAME) leads to playground not associated with those at home (AWAY GAME),
20 Takes care of (TREATS) eccentric (= anagram indicator) art set (art set = TREATS),
22 Crossbreed (MIX-), for one (-I-), getting new start (‘new’ start = -N-) working in the stable (groom = -G ROOM) (MIXING ROOM) sets the record straight? (MIXING ROOM),
24 Revolutionary leader (Wolfe TONE) gets to draw the line of borders (‘to draw the line’ of borders/sides = TONE),
25 Senior type (HEAD-) from Bar (bar/prohibit = -BAN-) finds 500 (-D) (HEADBAND) in court attire? (HEADBAND on tennis court),
26 Car (model T-) instalment (instalment/edition = -ISSUE) (TISSUE) in The Paper (TISSUE paper).
Down:
1 Scare a (scare a = CAESAR) crazy (= anagram indicator) emperor (CAESAR),
2 Behind the scenes around the edges (‘behind the scenes’ around the edges = BEES) working on the production of The Queen (BEES),
3 Top material (top ‘material’ = -M-) in tables (tables = LA-B STE-) designed (= anagram indicator) with foremost (‘with’ foremost/first = -M) (LAMB STEW) traditional sort from the kitchen (LAMB STEW),
4 Part underneath aircraft (part ‘underneath aircraft’ = THAI), in a manner of speaking (THAI),
5 Where one may paint a picture (STUDIO) of where someone is living (STUDIO),
6 For that competitive, childish lot handling the records (POTATO RACE), Spud (POTATO) is Irish (RACE) (POTATO RACE),
7 Penny (P-) passed on (-LATE-) awful (= anagram indicator) flu (flu = -FUL) (PLATEFUL) to dishy sort, of course (PLATEFUL),
13 Is not late (EARLY) taking flights (BIRDS) (EARLY BIRDS) with the meal deals (EARLY BIRDS),
14 Bristles (SETAE) at (at = -TA-) review (= reversal indicator) in diocese (SE-E) (SETAE),
16 Novel (NEW-) might need to be developed (site = -S ITE-) by Frenchman (Monsieur = -M) (NEWS ITEM) from The Irish Times, for example (NEWS ITEM),
17 Guess (ESTIMATE) you can expect the homemaker to arrive at this? (you can expect the homemaker/builder to arrive at this ESTIMATE),
19 Iranian neighbour (AFGHAN) provides a (A-) party (Fine Gael = -FG-) for Chinese ethnic group (-HAN) (AFGHAN),
21 What the butcher is selling (TONGUE) with boar from Baton Rouge (‘boar’ from ‘Baton Rouge’ = tonuge = TONGUE),
23 Tossed salad without sea salt (‘tossed salad’ without ‘sea salt’ = osdd = ODDS) for Casino patrons (ODDS),
24 Caretakers with no career (‘caretakers’ with no ‘career’ = taks = TASK) or piece of work (TASK).