This crossword No. 10518 clues and answers were published on Thu 22 Jan 2004 and the puzzle can be visited by following The Guardian Quick Crossword No. 10518 link.
All Across Clues and Answers:
1-across – Type of finish for external walls : PEBBLEDASH
7-across – Taking place in the open air : OUTDOOR
8-across – Hole in the head : SINUS
10-across – Inhabitant of northern Iraq : KURD
11-across – Smutty insinuation : INNUENDO
13-across – Mollusc sometimes eaten alive : OYSTER
15-across – Decorous : SEEMLY
17-across – Kitchen utensil able to hold about one fluid dram : TEASPOON
18-across – Wound mark : SCAR
21-across – George Cross, for instance : MEDAL
22-across – : PEACOCK
23-across – Construction on which to build : FOUNDATION
All Down Clues and Answers:
1-down – Apostle – saint – first Pope? : PETER
2-down – Anchored float : BUOY
3-down – Voice box : LARYNX
4-down – Restlessness : DISQUIET
5-down – Word meaning the same as another : SYNONYM
6-down – Lowest possible level : ROCKBOTTOM
9-down – Utterly skint : STONYBROKE
12-down – Cigar-shaped aircraft : ZEPPELIN
14-down – Difficult person – nobody in particular : SOANDSO
16-down – Fair game : HOOPLA
19-down – Red-nosed, long-shoed entertainer : CLOWN
20-down – Three Wise Men : MAGI
This crossword has in total 24 where 12 are across and 12 are down.