Across:
8 Society (S-) magazine (Elle = -ELLE-) ridicules top (‘Ridicules’ top = -R) (SELLER) dealer (SELLER),
9 It’s said in passing (OBITUARY) for notice (OBITUARY),
10 Shout from south-east (‘shout’ from ‘south-east’ = east = SEAT) – the politician assumes it for him (SEAT),
11 Lobby (SOLICIT-) around (-O-) America (-US) (SOLICITOUS) showing concern (SOLICITOUS),
12 Harms a (harms a) remarkable (= anagram indicator) (harms a = ASHRAM) Indian retreat (ASHRAM),
14 Fine wool (CASHMERE) from state (= homophone indicator) on Indian and Chinese border (‘Kashmir’ = ‘CASHMERE’),
15 What is 8 across doing (‘seller’ is SELLING) for individuals (ones = ONE’S) from 4 down (‘soul’ = SOUL) (SELLING ONE’S SOUL) dealing with Old Nick perhaps? (SELLING ONE’S SOUL),
18 Took benefit (SIGNED ON) from evidence (SIGN-) collected at the centre (‘collEcted’ at the centre = -E) on criminal boss (don = -D ON) (SIGNED ON),
20 Email (send = SE-ND) covers firm (-CO-) (SECOND) to support when it comes to the motion (SECOND),
22 Dotty (SILLY) and William (BILLY) (SILLY BILLY) – one’s a fool (SILLY BILLY),
24 Put out (SORE) by leaders of Senate overseeing Roman Empire (leaders of ‘Senate Overseeing Roman Empire’ = SORE),
25 It goes around The House (FLASHING), Furlong (F-) is working with The Whip (-LASHING) (FLASHING),
26 Names a (names a = SEAMAN) criminal (= anagram indicator) working in Mediterranean, for one (SEAMAN).
Down:
1 Give us a break (RECESS) in relation (RE-) to key (music key -C-) for fair (half) access (half ‘accESS’ = -ESS) (RECESS),
2 Crack (crack/gap = SLOT) found in some of the Oslo tenement (found in some of the ‘oSLO Tenement’ = SLOT),
3 One of the locals (IRISHMAN) is (-IS-) with her majesty (Her Majesty = -HM-) in Muslim country (IR-AN) (IRISHMAN),
4 On both sides, sounds like beautiful (on both sides ‘SOunds like beautifUL’ = SOUL) type of music (SOUL),
5 Circulates missing tale (‘circulates’ missing ‘tale’ = circus = CIRCUS) – the one with those walking a tightrope (CIRCUS),
6 Do something with the speech in a playful way (PUT TO MUSIC) for Park (PUT) Summit (top)? Finish off (p) (‘top’ without ‘p’ = TO) notes! (notes = MUSIC) (PUT TO MUSIC),
7 Four by four (four + four = FROUFROU) convertible (= anagram indicator) – the one used by the dressmakers, in a decorative sense (FROUFROU),
13 Change one’s mind (RELENT-) at Takeaway (-LESS) (RELENTLESS), as it’s non-stop (RELENTLESS),
14 Is fooling around (CLOWN) with one of those in 5 down (one of those in ‘circus’ = CLOWN),
16 Is entitled (ELIGIBLE) to be a single chap (ELIGIBLE bachelor),
17 Literary writer (ESSAYIST) from Spain (E-) has relative (sis = -S-IS-) travelling around state (-SAY-) by car (model -T) (ESSAYIST),
19 Build (build) complex (= anagram indicator) (build = DUBLI-) with new (-N) (DUBLIN) capital (DUBLIN)
21 Under no circumstances is (no way = NO-WAY) include writing (-R-) (NORWAY) from the country (NORWAY),
23 It appeals to first-time builders (LEGO) offering a brick-by-brick construction (LEGO),
24 Long-necked bird (SWAN) in boat coming from Botswana (‘boat’ coming from ‘Botswana’ = swna = SWAN).