This crossword No. 12431 clues and answers were published on Mon 15 Mar 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12431 link.
All Across Clues and Answers:
1-across – Unit of electromotive force : VOLT
3-across – Instant record of an event : SNAPSHOT
8-across – Weakest animal in a litter : RUNT
9-across – Shocked : STARTLED
11-across – Stop work : CALLITADAY
14-across – Common British songbird : THRUSH
15-across – Capital of Lebanon : BEIRUT
17-across – Faultless : IMPECCABLE
20-across – Forever : ETERNITY
21-across – Large pointed tooth : FANG
22-across – Menace : THREATEN
23-across – Become engaged : MESH
All Down Clues and Answers:
1-down – Truthfulness : VERACITY
2-down – Publican : LANDLORD
4-down – Passable : NOTBAD
5-down – Indestructibility : PERMANENCE
6-down – Any one of three F1 driving champions : HILL
7-down – Uncluttered : TIDY
10-down – Alcoholism — so dim a pain : DIPSOMANIA
12-down – Card game : CRIBBAGE
13-down – Exhaustively : ATLENGTH
16-down – North Yorkshire town : SETTLE
18-down – Handy : DEFT
19-down – Shakespearean king : LEAR
This crossword has in total 24 where 12 are across and 12 are down.