This crossword No. 12501 clues and answers were published on Fri 04 Jun 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12501 link.
All Across Clues and Answers:
1-across – Action that is genuine but seems not to be : DOUBLEBLUFF
9-across – Very narrow : WAFERTHIN
10-across – Tavern : INN
11-across – Oxford crew, perhaps? : EIGHT
13-across – End a call : RINGOFF
14-across – With wicked intent : EVILLY
15-across – Onto land : ASHORE
18-across – Bear witness : TESTIFY
20-across – Something worth having : ASSET
21-across – Black-belt grade of proficiency : DAN
22-across – As a linage : ANALGESIA
24-across – Minor disagreement : CONTRETEMPS
All Down Clues and Answers:
2-down – Rancid : OFF
3-down – Former establishment for offenders aged 15 to 21 : BORSTAL
4-down – Advise strongly : EXHORT
5-down – First Premier of the Soviet Union : LENIN
6-down – Superficial : FRIVOLOUS
7-down – Demon barber of Fleet Street : SWEENEYTODD
8-down – Futile : INEFFECTUAL
12-down – Effect produced by playing a series of notes very rapidly : GLISSANDO
16-down – Sequin : SPANGLE
17-down – Whirl : GYRATE
19-down – Not appropriate : INAPT
23-down – Exhaust : SAP
This crossword has in total 24 where 12 are across and 12 are down.