This crossword No. 12056 clues and answers were published on Tue 30 Dec 2008 and the puzzle can be visited by following The Guardian Quick Crossword No. 12056 link.
All Across Clues and Answers:
1-across – Is obliged to : MUST
3-across – Advantage : WHIPHAND
9-across – Lady’s bedroom : BOUDOIR
10-across – Small diagram contained by larger one : INSET
11-across – Native inhabitants of northern Scandinavia : LAPPS
12-across – Increase in volume : EXPAND
14-across – Resisting the temptation to laugh : STRAIGHTFACED
17-across – Object thrown in athletic event : DISCUS
19-across – Relating to warships : NAVAL
22-across – Bring down : LOWER
23-across – Chestnut or almond, for example : NUTTREE
24-across – Devon port city : PLYMOUTH
25-across – Openly resist : DEFY
All Down Clues and Answers:
1-down – Prepare for war : MOBILISE
2-down – Sudden drop in business : SLUMP
4-down – Conker : HORSECHESTNUT
5-down – Titivate : PRIMP
6-down – Poisonous element : ARSENIC
7-down – Fruit – appointment : DATE
8-down – Japanese art of growing dwarfed trees : BONSAI
13-down – Unfaithfulness to one’s spouse : ADULTERY
15-down – Transport system : RAILWAY
16-down – Having an end : FINITE
18-down – Freight : CARGO
20-down – Edge : VERGE
21-down – Blow with open hand : SLAP
This crossword has in total 26 where 13 are across and 13 are down.