This crossword No. 12052 clues and answers were published on Tue 23 Dec 2008 and the puzzle can be visited by following The Guardian Quick Crossword No. 12052 link.
All Across Clues and Answers:
1-across – Rounded protuberance : HUMP
3-across – Figure of speech – other map : METAPHOR
8-across – Skilful : ABLE
9-across – Set in place : POSITION
11-across – Proof against leaking : WATERTIGHT
14-across – Prove to be true : VERIFY
15-across – Spicy condiment : PEPPER
17-across – Examine closely – runs cities : SCRUTINISE
20-across – Supporting facts : EVIDENCE
21-across – Safeguard in electrical circuit : FUSE
22-across – In conjunction : TOGETHER
23-across – Eager – lament : KEEN
All Down Clues and Answers:
1-down – Spell of very warm weather : HEATWAVE
2-down – Relating to armed forces : MILITARY
4-down – Arousing sexual desire : EROTIC
5-down – Numerical calculations : ARITHMETIC
6-down – Successor to position or estate : HEIR
7-down – Let out – torn : RENT
10-down – Well-skilled : PROFICIENT
12-down – Natural ability : APTITUDE
13-down – Unlimited scope for action : FREEREIN
16-down – Savoury tart with egg-based filling : QUICHE
18-down – Nuisance : PEST
19-down – Appendage aiding flight : WING
This crossword has in total 24 where 12 are across and 12 are down.