This crossword No. 10387 clues and answers were published on Wed 20 Aug 2003 and the puzzle can be visited by following The Guardian Quick Crossword No. 10387 link.
All Across Clues and Answers:
1-across – It flexes the forearm : BICEPS
4-across – Grab – set of eggs : CLUTCH
9-across – Pioneer scientist : GALILEO
10-across – Unit of heat : THERM
11-across – Love affair : AMOUR
12-across – Show with singing and dancing : MUSICAL
13-across – One with no divisors : PRIMENUMBER
18-across – Flamboyance : PANACHE
20-across – Like a judge? : SOBER
22-across – Very short moment : TRICE
23-across – Consume – bird! : SWALLOW
24-across – Render ineffective : NEGATE
25-across – Thin covering layer : VENEER
All Down Clues and Answers:
1-down – Mendicant : BEGGAR
2-down – Stringed instrument : CELLO
3-down – Traveller to shrine etc : PILGRIM
5-down – Plant : LOTUS
6-down – Sweet, sticky stuff : TREACLE
7-down – Lowly : HUMBLE
8-down – Gumption : COMMONSENSE
14-down – No chance if you’re out of it : RUNNING
15-down – Communication that is sent : MESSAGE
16-down – Exactly right : SPOTON
17-down – Maker of beer etc : BREWER
19-down – Top of mountain or wave : CREST
21-down – Nonsense – in bottom of boat : BILGE
This crossword has in total 26 where 13 are across and 13 are down.