Across:
8 Cleaner (VACUUM) visits top ('Visits' top =V-) college (-C-) and university (Ulster University = -UU-) in the morning (-A-M) (VACUUM),
9 Greenish-blue (AQUA-) spirit (-R-UM) found around summit on Islay (summit on ‘Islay’ = -I-) (AQUARIUM) out of tank (AQUARIUM),
10 Local traffic in (local traffic in/trade in = HAWK) part of Howth? Awkward! (part of ‘howtH AWKward’ = HAWK),
11 It’s about (RE-) a (-A-) fellow in Trinity (fellow in Trinity/“Father, SON and Holy Spirit” = -SON-) who is gifted (-ABLE) (REASONABLE) and fair (REASONABLE),
12 Environmentalist has no intentions (‘environmentalist’ has no ‘intentions’ = evrmal = MARVEL) – is that something to write home about? (MARVEL),
14 Revolutionary (Che Guevara = CHE-) films (-MISTS) (CHEMISTS) with drug dealers (CHEMISTS),
15 Stops along the route (RAILWAY STATIONS) in bar (RAIL-) near course (-WAY) providing work for the guards (STATIONS) (RAILWAY STATIONS),
18 Has uncle (has uncle) trembling (= anagram indicator) (has uncle = LAUNCHES) with product rollouts (LAUNCHES),
20 Attractive sort (MAGNET) of reading material (MAG-) picked up when fishing (-NET) (MAGNET),
22 Kind (TYPE-) women (-W-) taking holy orders, for example (-RITE-), introducing reform (introducing ‘Reform’ = -R) (TYPEWRITER) essential to the old office (TYPEWRITER),
24 Some of the belief is transitory (some of the ‘belieF IS Transitory = FIST) and that can hurt when hit with it (FIST),
25 Sally (sally = raid) backed (= reverse indicator) (raid = DIAR-) a number of awards from university (firsts = 1sts = -ISTS) (DIARISTS) to writers synonymous with the Daily Record (DIARISTS),
26 Cervantes’s missing cats (‘cervantess’ missing ‘cats’ = ervnes = NERVES) and butterflies (NERVES).
Down:
1 Unmanageable without legume ('unmanageable' without 'legume' = nanaab = BANANA) or fruit (BANANA),
2 Place to retire (BUNK) for British (B-) national (-N-) found ensconced in neighbour’s land (UK = -U-K) (BUNK),
3 Handy personal cover (UMBRELLA) is something to put away for a rainy day (UMBRELLA),
4 Facts of figures (DATA) around revolutionary (= reverse indicator) atomic warhead (around ‘ATomic warheAD’ = atad =DATA),
5 Mark’s successor (EURO- successor to German mark) gets capital punishment (capital ‘Punishment’ = -P-) for extreme crime (extreme ‘crimE’ = -E) (EUROPE) in our community (EUROPE),
6 Is (-IS-) following (= position indicator) paper (ORGAN-) popular (-IN-) with legend (‘leG’ end = -G) (ORGANISING) working for The Union (ORGANISING),
7 Report (BULLETIN) of university (University of Limerick = -UL-) accommodation (-LET-) in storage site (B-IN) (BULLETIN),
13 Offers (VOLUNTEERS) to adapt (= anagram indicator) novels? True! (novels true = VOLUNTEERS),
14 The overheads (COSTS) of setting up (= reverse indicator) characters in populist society (characters in ‘populiST SOCiety’ = stsoc = COSTS)
16 Breakdown (ANALYSIS) of Asians (Asians) travelling (= anagram indicator) (Asians = ANA-SIS) around central Ireland (central ‘ireLand’ = -L-) with foreign currency (yen = -Y-) (ANALYSIS),
17 Appreciating (ADMIRING) Bill (AD-) over (= reverse indicator) border (‘rim = -MIR-) popular (-IN-) with Government (-G) (ADMIRING),
19 Sarah’s (Sarahs) problem (= anagram indicator) (Sarahs = HARASS) with Harry (harry/attack = HARASS),
21 It’s simpler (EASIER) getting list from Israelites (‘list’ from ‘Israelites’ = israee = EASIER),
23 Examination (TEST) dividing graduate students (dividing ‘graduaTE STudents’ = TEST),
24 Stockholder (FARM) producing Fromage Frais, cuts foie gras (‘fromage frais’ cuts ‘foie gras’ = rmaf = FARM).