This crossword No. 749 clues and answers were published on Sun 24 Jan 2010 and the puzzle can be visited by following The Guardian Speedy Crossword No. 749 link.
All Across Clues and Answers:
1-across – Insane or very stupid : ROUNDTHEBEND
9-across – Admit to wrongdoing : OWNUP
10-across – Extra, ancillary benefit : SPINOFF
11-across – Niche : NOOK
12-across – Medicinal plant : ALOEVERA
14-across – Natural ability or quality : TALENT
15-across – Skin disorder : ECZEMA
18-across – First public performance of a : PREMIERE
20-across – Cowboy boot attachment : SPUR
22-across – Aristocratic domain above a viscountcy : EARLDOM
23-across – Barns for cows : BYRES
24-across – Try to attract a suitor : SETONESCAPAT
All Down Clues and Answers:
2-down – Action which backfires : OWNGOAL
3-down – California wine valley : NAPA
4-down – Rough-and-tumble : TUSSLE
5-down – Esteem : EMINENCE
6-down – Become ground down or deteriorate : ERODE
7-down – Insane or very stupid : DAFTASABRUSH
8-down – Being about to publish : GOINGTOPRESS
13-down – Not commanded : UNBIDDEN
16-down – I’m a rope : EMPORIA
17-down – Outdoes : TRUMPS
19-down – White heron : EGRET
21-down – Palindromic 70s pop group : ABBA
This crossword has in total 24 where 12 are across and 12 are down.