This crossword No. 504 clues and answers were published on Sun 08 May 2005 and the puzzle can be visited by following The Guardian Speedy Crossword No. 504 link.
All Across Clues and Answers:
1-across – Great stratagem : MASTERPLAN
7-across – Discolour, stain : TARNISH
8-across – Nasal speech : TWANG
10-across – Reverberate : ECHO
11-across – Having no idea : CLUELESS
13-across – Fine weave : TISSUE
15-across – Film music arranger : SCORER
17-across – Chafe, annoy : IRRITATE
18-across – Signify : MEAN
21-across – Additional : EXTRA
22-across – Compound : AMALGAM
23-across – Alter pace of : CHANGEGEAR
All Down Clues and Answers:
1-down – Merriment : MIRTH
2-down – Expectorate : SPIT
3-down – Breathe out : EXHALE
4-down – Solo card game : PATIENCE
5-down – Layman : AMATEUR
6-down – With urban savoir-faire : STREETWISE
9-down – Art of eating well : GASTRONOMY
12-down – Four-line stanza : QUATRAIN
14-down – Extend : STRETCH
16-down – Attack from the air : STRAFE
19-down – Keen : EAGER
20-down – Vigil : WAKE
This crossword has in total 24 where 12 are across and 12 are down.