This crossword No. 11830 clues and answers were published on Tue 08 Apr 2008 and the puzzle can be visited by following The Guardian Quick Crossword No. 11830 link.
All Across Clues and Answers:
1-across – Safety structure in centre of motorway : CRASHBARRIER
9-across – Form of oxygen : OZONE
10-across – Make happy : GLADDEN
11-across – Bird of prey – light, wind-borne structure : KITE
12-across – Mendacious Shakespearean knight : FALSTAFF
14-across – Constricted : NARROW
15-across – Supporting staff : CRUTCH
18-across – Principal – churchman : CARDINAL
20-across – Serene : CALM
22-across – : ABSINTH
23-across – Lower part of collar on coat : LAPEL
24-across – Dedicated to one outcome : SINGLEMINDED
All Down Clues and Answers:
2-down – Cockerel : ROOSTER
3-down – Killed – a lot : SLEW
4-down – One seeking alms : BEGGAR
5-down – Give confidence to : REASSURE
6-down – South Asian republic : INDIA
7-down – Ordinary : RUNOFTHEMILL
8-down – Blue-collar : WORKINGCLASS
13-down – Imaginary – in on a lot : NOTIONAL
16-down – Walk roughly over : TRAMPLE
17-down – Discover the meaning of – six feet : FATHOM
19-down – Got up : RISEN
21-down – Tribal group with common ancestor : CLAN
This crossword has in total 24 where 12 are across and 12 are down.