Across:
8 One of those stockists (SELLER) of school (S-) magazine (-ELLE- magazine) gets first refusal (first ‘Refusal’ = -R) (SELLER),
9 Sing, roar? (sing roar = GARRISON) Belt (= anagram indicator) out of military base! (GARRISON),
10 Queens (BEDS) assembled without males? (‘assembled’ without ‘males’ = sebd = BEDS),
11 A range of keyhole surgeries perhaps (INSIDE JOBS) illegally committed by those working on the premises (INSIDE JOBS),
12 Samuel (SA-M) conceals Diana’s (Di’s = -DIS-) (SADISM) humiliating cruelty (SADISM),
14 Has an appreciation for (has an EYE- for) what goes into port (-LINER) (EYELINER) and its make up (it’s make-up = EYELINER),
15 Put one’s mind to the test (SELF-EXAMINATION) by looking into your own heart (SELF-EXAMINATION),
18 Each trip (each trip), suspect (= anagram indicator) (each trip = PIE CHART) produced graph (PIE CHART),
20 Theologian (Doctor of Divinity = -DD-) consumed by beastly type (mule = MU-LE) (MUDDLE) in chaos (MUDDLE),
22 A sad novice (a sad novice) confused (= anagram indicator) (a sad novice = AVOIDANCES) by dodges (AVOIDANCES),
24 Stop (‘stop’ SIGN) veteran from Evening Star (‘veteran’ from ‘evening star’ = ings = SIGN),
25 Drawing the inference (ASSUMING) from new (= anagram indicator) mags in US (mags in US = ASSUMING),
26 Penny (-P-) and Bill (-AD) tracking (= positional indicator) legend (KEY-) (KEYPAD) on an electronic device (KEYPAD).
Down:
1 One of the Greens (pea = PE-A) possesses place (-SET-) (PESETA) in old European capital (capital/money = PESETA),
2 Those from the watering hole (ALES) concealed by elevated (= reversal indicator) Japanese Laurels (concealed by elevated ‘JapaneSE LAurels’ = sela = ALES),
3 What the detective picks up (TRAIL) from Mick’s (micks) reports? (= homophone indicator) (‘micks’ = ‘MIX’) (TRAIL MIX) The travellers are bound to swallow them! (snack of dried fruit/nuts = TRAIL MIX),
4 It takes a very long time (AGES) for the Wise Guys (sages) to lose the head (s) (‘sages’ without ‘s’ = AGES)
5 Union-member (bride = BRID-E) holds key (music key = -G-) (BRIDGE) to golden gate, for example? (Golden Gate BRIDGE),
6 Incoherent type (DISJOINTED) passed away (died = DI-ED) over small (-S-) local bar (-JOINT-) (DISJOINTED),
7 Grave (SOMBRE-) exchange of words (row) isn’t finished (w) (‘row’ without ‘w’ = -RO) (SOMBRERO) for one hiding from The Sun (SOMBRERO),
13 UNICEF is to (UNICEF is to) change (= anagram indicator) (unicef is to = INFECTIOUS) and it’s catching (INFECTIOUS),
14 Son is out of mementos (‘son’ is out of ‘mementos’ = memet = EMMET) of old Irish revolutionary (Robert EMMET),
16 One needed to leave (EXIT VISA) by gate (EXIT) coming from the embassy (VISA) (EXIT VISA),
17 Important person (NAME-) on the drink in Tokyo (-SAKE) (NAMESAKE) has the same signature as Louis XIII, for example? (NAMESAKE),
19 Haunted out of Chateaubriand (‘haunted’ out of ‘Chateaubriand’ = cabria = ARABIC), or that’s what they’re saying in Tunis (ARABIC),
21 Comes to a standstill (LOGJAM) with record (LOG-) to preserve (-JAM) (LOGJAM),
23 Confining the movement of the bullish types (CAGE) in public agencies (in ‘publiC AGEncies’ = CAGE),
24 Iran isn’t part of the Assyrian (‘Iran’ isn’t part of the ‘Assyrian’ = assy = SAYS) States (SAYS).