Since this post is late, and to reflect the difficulty (or otherwise) of the puzzle, I’ll keep it short…
ACROSS
1 ROBERT(BURN)S – referring to Lord Roberts of Kandahar. As any good Scot would know, Burns’ birthday is celebrated on 25 January by the consumption of vast amounts of haggis, neeps, tatties and a guid malt.
16 ISOCRATES – (ostracise)* – an influential Greek orator
17 PETER-HOUSE – the oldest college at Cambridge University
24 SCO(t)-URGE – not sure how “finally covered” indicates that you have to remove the final letter of Scot?
29 P-HOBOS – the larger of Mars’ two moons
30 GLASSHOUSE – a glasshouse is a military dention centre and people in glass houses shouldn’t throw stones, but the wordplay here doesn’t make sense beyond that
39 CAM-BRIDGES-HIRE – Robert Seymour Bridges (1844-1930)
57 HOLIDAY CAMP – (I may hold cap)*
DOWN
2 BLOW ONE’S OWN TRUMPET
9 SONG OF SONGS – the 22nd book of the Old Testament
18 TROILUS AND CRESSIDA – (sari lass introduced)*
21 GOLIATH – (<=h(tail)og)
52 IVAN(hoe)
I thought 3dn (“Horseman said to give name to sporting contest” (5)) was ambiguous – I went for RYDER but isn’t RIDER also justifiable?
3dn Horseman said to give name to sporting contest (5)
>I think it’s unambiguously RYDER
I completely disagree, and am actually quite baffled by your reasoning. I pondered for a while about this one and decided that RIDER was marginally the more likely solution, but I suspect that in a Championship the adjudicator would have to allow either. I’m not sure that even the ST would come up with your clue – too obviously unsound even for them!? (Oh well, perhaps not 😉