Across:
8 Report (RELATE) from central Florence (central ‘Florence’ = RE-) on The Dead (the dead = -LATE) (RELATE).
9 Urge pool (urge pool = PROLOGUE) model (= anagram indicator) to put this in a book at the start (PROLOGUE),
10 Old man in Boston (‘old man’ = father = POPS) opens 15 across (‘pops the question’ = POPS),
11 One Direction (EAST) is not out (is IN) to stop working (-DIE-) with lead singer (lead ‘singer’ = -S) (EAST INDIES) from the Malay Archipelago (EAST INDIES),
12 It’s more profound (DEEPER) to take organists out of great depression (remove ‘organists’ from ‘great depression’ = edepre = DEEPER),
14 Makes a great show (PRODUCER) of food (PRODUCE-) recipe (-R) (PRODUCER),
15 Proposes to someone (POPS THE QUESTION) from pet shop (pet shop = POPS THE) breaking up (= anagram indicator) with 25 across (‘question’ = QUESTION) (POPS THE QUESTION),
18 Coach (coach = bus = B-US-) admits 50 per cent (half) commerce (half ‘commerce’ = -ERCE-) is key (music key -E) (BERCEUSE) for Lullaby (lullaby = BERCEUSE),
20 Produces (= anagram indicator) Fiver (fiver = VERIF-) Friday ultimately (‘Friday’ ultimately = -Y) (VERIFY) with support (VERIFY),
22 Those in the driving seat (CHAUFFEURS) in Switzerland (CH-) found with gold (-AU-) and iron (-FE-) in expensive coats (furs = -F-URS) (CHAUFFEURS),
24 Sketch (DRAW) of old Penny (old penny coin = D-) Callow (naive = -RAW) (DRAW),
25 Make a point of asking (QUESTION) inquiry (QUESTION),
26 Spirits (GHOSTS) of great (G-) party leaders (-HOSTS) (GHOSTS).
Down:
1 Has done more than most to change what’s on television (REMOTE) in the sticks (REMOTE),
2 Forbids (BARS) public houses serving drink (BARS),
3 Groundwork (RESEARCH) for showing off (= anagram indicator) cars here (car here = RESEARCH),
4 Some characters develop useful (some characters ‘develop useful’ = OPUS) work by the artist (OPUS),
5 Movement (= anagram indicator) in boot (in boot = BONITO) is more than a little fishy (BONITO),
6 Hatchet man (WOODCUTTER) brought in to cut the dead wood out of Nottingham Forest (WOODCUTTER),
7 First class (SUPER-), for example (e.g. = -EG-), has nothing (-O) (SUPEREGO) that will play on your mind perhaps (SUPEREGO),
13 You’d expect the students to take this (PASS COURSE) free ticket (PASS) for The Open (COURSE for The Open golf tournament) (PASS COURSE),
14 Sounds like what’s on top of Carrauntoohil, for example (“peak” = “pique” = PIQUE), leads to irritation (PIQUE),
16 Service (OVERHAUL) that’s a laugh (-HA-) in new (= anagram indicator) Louvre (Louvre = OVER-UL) (OVERHAUL),
17 Picture (ENVISAGE) of Geneva is (Geneva is = ENVISAGE) suspicious (= anagram indicator),
19 It’s not just (UNFAIR) a foreign (a = UN-) exhibition (-FAIR) (UNFAIR),
21 Allegiance (FEALTY) to a lefty (a lefty = FEALTY) movement (= anagram indicator),
23 Runs (runs = URNS) out (= anagram indicator) for The Ashes (URNS),
24 Doing nothing for banks (“doing nothing for” banks/sides = DOOR) on the way out (DOOR).