Nothing much to hold folk up here, so long as non-sporty types are sufficently clued up on their sweaty types in the scrum. I did this online at home while Typhoon Usagi petered out and managed a possible PB of 13:36, earning myself 6th place on the leaderboard at the time. Should have got me Canon out for posterity...
Perhaps I could give a shout-out to Sunday's Jeff Pearce if anyone's missed it and has time on their hands. Not hard, but very elegant.
Across
1 INFORM+AL[l]
5 HANSOM - H[enry] + MOANS*.
9 EXERCISE - double definition.
10 D[ALL]AS - city of shoulder-pads and big hair.
12 THOROUGH+FARE
15 [w]INNER
16 LOOSE HEAD - the loosehead prop (wearing 1) is usually slightly less fat than the tighthead (3) and is distinguishable from his mate by having one ear (the left) that doesn't look like a cauliflower.
18 PROFESSOR - PROCESSOR with C changed to F; only one I didn't parse while solving.
19 RADON - ADO in RN (our, i.e. Brits', sailors).
20 INDIANAPOLIS - IN + DIANA + POLIS[h].
24 TRIVET - [restuaran]T + RIVET; my last in.
25 AGAR-AGAR - A GAR is a fish and AGAR-AGAR (or simply AGAR) is jelly from seaweed used in kitchens and crosswords.
26 DIKTAT - KID reversed + TAT.
27 FRONT ROW - FRONT (promenade) + ROW (paddle); Collins 'paddle 13' has 'to row (a boat) steadily, esp (of a racing crew) to row firmly but not at full pressure'. Those fat blokes in 16 together with a hooker comprise the front row of the scrum. Must be fun, if a bit cramped.
Down
1 IDEA[l]
2 FLEE[t]
3 RACEHORSE - cryptic definition and not that bad; a jumper is a horse that has to negotiate fences or hurdles as it gallops round wearing its owner's colours.
4 AUSTRALASIAN - ALAS in AUSTRIAN for a native of Port Moresby taken in by the anti-freeze in Tyrolean wine?
6 AWASH - A + W + ASH.
7 SALSA VERDE - SERVE SALAD*; foodies will have heard of this, which rules me out.
8 MISLEADING - MIS[s] + LEADING (first).
11 RUMOUR-MONGER - R[elatives] in MORGUE MOURN*.
13 PINPOINTED - PIN (nail) + POINTED (sharp).
14 IN GOOD NICK - an &lit; NICK is slang for prison, and IN GOOD NICK is an idiom meaning 'in good condition' or, of a sportsperson, 'in good form'.
17 EARLIER ON - [alsac]E + LORRAINE*.
21 ARE[N]A
22 IGOR - hidden(-ish); Ruddigore is by G&S, while Prince Igor is the excellent Russian composer Alexander Borodin's best known work. Smart chap, Borodin - he was also a chemist and a doctor.
23 D+RAW - 'take out' as in 'draw blood'.