This crossword No. 11520 clues and answers were published on Tue 10 Apr 2007 and the puzzle can be visited by following The Guardian Quick Crossword No. 11520 link.
All Across Clues and Answers:
1-across – Trifle – swindle : FIDDLE
4-across – Catchy verse in advert : JINGLE
8-across – Increased : RISEN
9-across – Treacly : VISCOUS
10-across – Crush : SQUEEZE
11-across – Part of flower : PETAL
12-across – Reverse one’s opinion or course of action : BACKPEDAL
17-across – Noble gas used in light bulbs : ARGON
19-across – Vast : IMMENSE
21-across – Exhausted – at full speed : FLATOUT
22-across – Itinerary : ROUTE
23-across – Come to an end : EXPIRE
24-across – Trashy : SHODDY
All Down Clues and Answers:
1-down – Area thick with trees : FOREST
2-down – Intrude on : DISTURB
3-down – Sudden thrust forward : LUNGE
5-down – Tasteless : INSIPID
6-down – Show malicious smugness : GLOAT
7-down – With no difficulty : EASILY
9-down – Attitude that determines outlook : VIEWPOINT
13-down – Frankness : CANDOUR
14-down – Sluggish : LANGUID
15-down – Meaningless talk – kind of cake : WAFFLE
16-down – Opinion contrary to orthodox belief : HERESY
18-down – Clutch : GRASP
20-down – Laughter : MIRTH
This crossword has in total 26 where 13 are across and 13 are down.