Across:
8 Psychologist dismisses ghosts (‘psychologist’ dismisses ‘ghosts’ = pycloi = POLICY) out of dogma (POLICY),
9 Ripens or (ripens or = PRISONER) develops (= anagram indicator) in the cell (PRISONER),
10 Frank (OPEN) is similar to 21 down (‘uncork’ is similar to OPEN),
11 Put in a bad light (COMPROMISE) by angry (= anagram indicator) cop’s memoir (cops memoir = COMPROMISE),
12 Finishes the lot (USES UP) and takes drugs (USES) to stay awake (UP) (USES UP),
14 Surveying (SCANNING) for Carol (sing = S-ING) involves Charlie (-C-) and Ann (-ANN-) (SCANNING),
15 Shaw (Shaw = WASH-) adaptation (= anagram indicator) has stylish (-IN-), boxer (pug) knocking back (= reversal indicator) (pug = -G UP) drink (LIQUID) (WASHING-UP LIQUID) with cleaner (WASHING-UP LIQUID),
18 What those in takeovers do (COLONISE) with people (people/occupy = COLONISE),
20 French (-F-) university (University of Limerick = -UL) on Parisian street (Parisian/French ‘street’ = RUE-) opens (= position indicator) (RUEFUL) expressing regret (RUEFUL),
22 Jeer (BOO-) young chap (boy) heartless (o) (‘boy’ without ‘o’ = -BY) for getting award (PRIZE) (BOOBY PRIZE) of wooden spoon (BOOBY PRIZE),
24 Type of welcome (welcome PACK) for a group of wolves? (PACK of wolves),
25 Large vehicle (limousine) isn’t finished (e) (‘limousine’ without ‘e’ = LIMOUSIN) for the French cattle (LIMOUSIN cattle and a province),
26 That’s just great (SUPERB) – member of the European Union (Serb = S-ERB) admits losing the head (t) with a battering type? (battering ram = ‘tup’ without ‘t’ = -UP-) (SUPERB).
Down:
1 A number of pairs (couples) left out (‘l’) (‘couples’ without ‘l’ = COUPES) in a number of types of cars (COUPES),
2 Louis I of Naples leads (‘Louis I Of Naples’ leads = LION) one of those with pride (LION),
3 Hang (= LYNCH -) picture – the first (‘Picture’ the first = -P-) at home (-IN) (LYNCHPIN) of person vital to the business (LYNCHPIN / linchpin)
4 Unwanted junk-mail (SPAM) not from the postman (‘not’ from the ‘postman’ = psma = SPAM),
5 Is rare (is rare = SIERRA) rock (= anagram indicator) from a range of mountains? (SIERRA),
6 Report (COMMUNIQUÉ) to group sharing everything (commune = COMMUN-E) about level of intelligence (-IQ-) at university (-U-) (COMMUNIQUÉ),
7 He’s (HE-S-) left (-L-) inside writing material (-INK-) for institute (-I) (HELSINKI) in Europe (HELSINKI),
13 The volume of students (SCHOOLBOOK) carried to class? (SCHOOLBOOK),
14 Panfry (SAUTÉ) and use (= anagram indicator) a suet (a suet = SAUTÉ).
16 Written justification (APOLOGIA) by American (A-) PA (-P-A) overseeing igloo (igloo = -OLOGI-) building (= anagram indicator) (APOLOGIA),
17 Big (LARGE-) ship (-SS-) linked to oriental (East = -E) (LARGESSE) charity (LARGESSE),
19 One (I-) foreign politician (-MP-) is (-IS-) at height (-H) (IMPISH) of mischievous behaviour (IMPISH),
21 Organisation (UN-) in Ireland (-CORK) (UNCORK) to open port (UNCORK),
23 Bars (INNS) aroma from San Marino (‘aroma’ from ‘San Marino’ = snin = INNS),
24 Young boxer (PUP-) at a (-A) (PUPA) stage where flighty one is not fully formed (PUPA).