This crossword No. 673 clues and answers were published on Sun 10 Aug 2008 and the puzzle can be visited by following The Guardian Speedy Crossword No. 673 link.
All Across Clues and Answers:
1-across – Dutifully polite commonly-spoken American valediction : HAVEANICEDAY
9-across – Audacious robbery : HEIST
10-across – North American reindeer : CARIBOU
11-across – Flip in the air : TOSS
12-across – Diabolical : DEVILISH
14-across – ‘Uniform’ often associated with ASBO offenders : HOODIE
15-across – Prehistoric communal Native American culture : PUEBLO
18-across – Those who manage property, etc for someone else : STEWARDS
20-across – Midge, mosquito : GNAT
22-across – Is Annie? : ASININE
23-across – Shoulder wrap : SHAWL
24-across – Act meekly and apologetically : EATHUMBLEPIE
All Down Clues and Answers:
2-down – Italian Renaissance poet : ARIOSTO
3-down – Victuals : EATS
4-down – Scored : NICKED
5-down – Intricate twist : CURLICUE
6-down – One of the UAE and its capital : DUBAI
7-down – Inexpensive supervised lodgings : YOUTHHOSTELS
8-down – Lazy designation when a title eludes : WHATSHISNAME
13-down – Italian sponge pudding : TIRAMISU
16-down – Ethnic group and language of NE Indian subcontinent : BENGALI
17-down – Word that modifies something other than a noun : ADVERB
19-down – Declaration : EDICT
21-down – —- of Dogs, Thames peninsula : ISLE
This crossword has in total 24 where 12 are across and 12 are down.