Across:
8 Log in leaving invigilator (‘log in’ leaving ‘invigilator’ = viiatr = TRIVIA) the unimportant facts (TRIVIA),
9 Worried about (AGONISED) sea dog in (sea dog in = AGONISED) trouble (= anagram indicator),
10 A part of Sandra Bullock (a part of ‘sanDRA Bullock = drab = BARD) elevated (= reversal indicator) by Shakespeare (BARD),
11 AXA Ireland (AXA Ireland = ALEXANDRIA) out of place (= anagram indicator) in Egypt (ALEXANDRIA),
12 One (I-) doing (doing = -NDIGO) work (= anagram indicator) (INDIGO) for Violet (INDIGO),
14 Rocky period in the past (STONE AGE) for individual (-ONE), in part (part/section = stage = ST- AGE) (STONE AGE),
15 Leak (‘leak’ = ‘leek’ = VEGETABLE) report of (= homophone indicator) remarkable (= anagram indicator) danger (danger = GARDEN) (VEGETABLE GARDEN) in Spud’s patch (VEGETABLE GARDEN),
18 Fish (cod = CO-D-) over lakes on rocky arid summits (‘Lakes On Rocky Arid’ summits = -LORA-) and around (-O) (COLORADO) part of United States (COLORADO),
20 We lost (we lost = LOWEST) out (= anagram indicator) in the end presumably (LOWEST in the end presumably),
22 Local capital (‘local’ capital/money = BREAD-) isn’t finished? (s) Crikey (‘crumbs’ without ‘s’ = -CRUMB) (BREADCRUMB) – what could one create with the smallest amount of dough! (one BREADCRUMB),
24 Stain that is generally left (BLOT) by pâté removed from table top (‘pâté’ removed from ‘table top’ = blto = BLOT),
25 Flawed (= anagram indicator) coup (coup = OPU-C-) takes in the French (the = -LE-) Nationalist (-N-) going to Spain (-E) (OPULENCE) with great wealth (OPULENCE),
26 Park (GARDEN) at the end of 15 across (end of ‘vegetable garden’ = GARDEN).
Down:
1 Order it officially (ORDAIN) for new (= anagram indicator) road (road = ORDA-) going up (= reversal indicator) north (NI = -IN) (ORDAIN),
2 As keen as mustard (AVID) for Moore to be taken out of road movie (‘Moore’ to be taken out of ‘road movie’ = advi = AVID),
3 Suspicious tendencies (PARANOIA) of soldier (PARA-) on a small charge (ion) arising (= reversal indicator) (ion = -NOI-) from being absent (-A) (PARANOIA),
4 Some characters break a leg (some characters ‘breaK A LEg = KALE) in 15 across (KALE in ‘vegetable garden’),
5 Rebellious (= reversal indicator) head (top = POT-) censor in old Rome (Cato) lost his head (c) (‘Cato’ without ‘c’ = -ATO) (POTATO) in the plot? (POTATO),
6 Theologian (Doctor of Divinity = -DD-) in race (mile race = MI-LE-) to get basic, opening (‘Basic’ opening = -B-) argument (-ROW) (MIDDLEBROW) that’s moderately challenging (MIDDLEBROW),
7 Cake (MERINGUE) menu – the first (‘Menu’ the first = M-) from Ireland (-ERIN-) for half the guests (for half the ‘guests’ = -GUE) (MERINGUE),
13 Turns up (= reversal indicator), the foreign (the = el = -LE) ban (bar = -RAB-) on cattle (oxen = -NEXO-) is initially (‘Is’ initially = I-) (INEXORABLE) relentless (INEXORABLE),
14 Getting poets out of Sevastopol (‘poets’ out of ‘Sevastopol’ = svaol = SALVO) – the military would be capable of that (SALVO),
16 Sounds like Freud’s holiday plans (EGO TRIPS) with presumably self-catering options (EGO TRIPS),
17 Jokes (gags = G -AGS) about old (old) short (d) (‘old’ without ‘d’ = -OL-), heartless (i) lie (‘fib’ without ‘i’ = -F B-) (GOLF BAGS) produced around the clubs (GOLF BAGS),
19 Constance has no son (‘Constance’ has no ‘son’ = ctance = ACCENT) and it’s a sign of stress, in a manner of speaking (ACCENT),
21 Opens (opens = SPO-EN) novel (= anagram indicator) over the weekend (‘weeK’ end = -K-) (SPOKEN) it is said (SPOKEN),
23 Part of warehouse receipt (part of ‘warehoUSE Receipt’ = USER) for consumer (USER),
24 Shafts (BARS) most of 10 across (most of ‘bard’ = BAR-) from society (-S) (BARS).