This crossword No. 11792 clues and answers were published on Sat 23 Feb 2008 and the puzzle can be visited by following The Guardian Quick Crossword No. 11792 link.
All Across Clues and Answers:
1-across – Sash wound as head-covering : TURBAN
4-across – Point of convergence of light, etc : FOCUS
7-across – What is yet to pass : FUTURE
8-across – Illusion caused by atmospheric refraction : MIRAGE
9-across – Italian city with famous tower : PISA
10-across – Shame : DISGRACE
12-across – Ping pong : TABLETENNIS
17-across – Blood feud : VENDETTA
19-across – Be appropriate – part of deck : SUIT
20-across – Slice : RASHER
21-across – Scrape up material from sea bed : DREDGE
22-across – Republic of North Africa : EGYPT
23-across – Horse : GEEGEE
All Down Clues and Answers:
1-down – Sightseeing holidaymaker : TOURIST
2-down – Plant with edible, acidic, leafstalks : RHUBARB
3-down – Alteration of document : AMENDMENT
4-down – Brief affair – chuck : FLING
5-down – Unleavened bread of the subcontinent : CHAPATI
6-down – Become furious : SEERED
11-down – Scurry off : SKEDADDLE
13-down – General pardon : AMNESTY
14-down – Savings kept in reserve : NESTEGG
15-down – Coarse gravel : SHINGLE
16-down – Disinclined : AVERSE
18-down – Build : ERECT
This crossword has in total 25 where 13 are across and 12 are down.