This crossword No. 10431 clues and answers were published on Fri 10 Oct 2003 and the puzzle can be visited by following The Guardian Quick Crossword No. 10431 link.
All Across Clues and Answers:
1-across – Small cake, often decorated with marzipan : PETITFOUR
8-across – Fuss : HOOHA
9-across – Dummy pill : PLACEBO
10-across – Dormancy : INACTION
11-across – Semiprecious stone – exhaust : JADE
13-across – Wimbledon sport : TENNIS
14-across – Peninsula in today’s Ukraine, site of an 1853-6 war : CRIMEA
16-across – Dish of diced meat etc – cannabis : HASH
17-across – Talk : CONVERSE
19-across – Get-together of old friends : REUNION
20-across – Part of a flight : STAIR
21-across – Where the principals dine : HIGHTABLE
All Down Clues and Answers:
1-down – Banana-like fruit : PLANTAIN
2-down – Move stealthily : TIPTOE
3-down – Someone from Bangkok, perhaps : THAI
4-down – Village in Bavaria, famous for its Passion Play : OBERAMMERGAU
5-down – Brazilian city : RIODEJANEIRO
6-down – New Zealand city : CHRISTCHURCH
7-down – South African city : JOHANNESBURG
12-down – Glacial fissure : CREVASSE
15-down – Socialise informally : HOBNOB
18-down – Leave at the altar : JILT
This crossword has in total 22 where 12 are across and 10 are down.