This crossword No. 12154 clues and answers were published on Thu 23 Apr 2009 and the puzzle can be visited by following The Guardian Quick Crossword No. 12154 link.
All Across Clues and Answers:
1-across – Highest army rank : FIELDMARSHAL
9-across – Noble gas : XENON
10-across – Winning six games in a row at tennis : LOVESET
11-across – Makes fun of — bones : RIBS
12-across – What one rings to be let in : DOORBELL
14-across – TV watcher : VIEWER
15-across – Snub : REBUFF
18-across – Area of southwest Scotland : GALLOWAY
20-across – Profit : GAIN
22-across – Jittery : NERVOUS
23-across – Proverb : ADAGE
24-across – Person’s weak spot : ACHILLESHEEL
All Down Clues and Answers:
2-down – Base — in globe : IGNOBLE
3-down – Solitary : LONE
4-down – Genial : MELLOW
5-down – Base of natural watercourse : RIVERBED
6-down – German state, capital Wiesbaden : HESSE
7-down – Fifth digit of hand : LITTLEFINGER
8-down – Lavishly staged entertainment : EXTRAVAGANZA
13-down – Blade shaped to produce lift — I fear loo : AEROFOIL
16-down – Not congnisant : UNAWARE
17-down – Scottish girl — Hollywood dog : LASSIE
19-down – Deciduous conifer : LARCH
21-down – : MASH
This crossword has in total 24 where 12 are across and 12 are down.