This crossword No. 12670 clues and answers were published on Sat 18 Dec 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12670 link.
All Across Clues and Answers:
1-across – Light once the actual source has gone : AFTERGLOW
8-across – Loo : PRIVY
9-across – Describing the M25 motorway? : ORBITAL
10-across – Relating to religious ministers : CLERICAL
11-across – Green — stone : JADE
13-across – Brown deposit in a field? : COWPAT
14-across – Talk — conference — meeting : POWWOW
16-across – English poet, d. 1744 : POPE
17-across – Battered squid rings : CALAMARI
19-across – Made one : UNIFIED
20-across – Chopper : TOOTH
21-across – Whisk : EGGBEATER
All Down Clues and Answers:
1-down – Not normal : ATYPICAL
2-down – Part of the body containing 3 : THORAX
3-down – Teases : RIBS
4-down – Mel Gibson film — gun, perhaps? : LETHALWEAPON
5-down – Boxer : WELTERWEIGHT
6-down – Small part of a rocket, containing instruments or crew : SPACECAPSULE
7-down – Practice of exchanging partners : WIFESWAPPING
12-down – Regardless of : NOMATTER
15-down – Outlaw : BANDIT
18-down – Very serious indeed : DIRE
This crossword has in total 22 where 12 are across and 10 are down.