This crossword No. 12483 clues and answers were published on Fri 14 May 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12483 link.
All Across Clues and Answers:
1-across – Ruthlessly : INCOLDBLOOD
9-across – Odd owners : DOWONDERS
10-across – Silvery-white metallic element : TIN
11-across – Ascend : CLIMB
13-across – Portentous : FATEFUL
14-across – Push forcefully : THRUST
15-across – Marine : REMAIN
18-across – Canadian province : ONTARIO
20-across – Common forest tree : BEECH
21-across – Priest’s long white sleeved vestment : ALB
22-across – Writer of malicious anonymous letters : POISONPEN
24-across – Heroine — gaily landed : LEADINGLADY
All Down Clues and Answers:
2-down – Modern : NEW
3-down – Collection of related works reprinted in one volume : OMNIBUS
4-down – Become extinct : DIEOFF
5-down – Pianist and composer Cockneys associate with Brahms : LISZT
6-down – Obsolete : OUTOFDATE
7-down – A docile aunt : EDUCATIONAL
8-down – Resolute : UNFLINCHING
12-down – Peevish : IRRITABLE
16-down – Involve in dispute : EMBROIL
17-down – Healing drink : POTION
19-down – Swift : RAPID
23-down – Fruit of a legume : POD
This crossword has in total 24 where 12 are across and 12 are down.