This crossword No. 10163 clues and answers were published on Fri 29 Nov 2002 and the puzzle can be visited by following The Guardian Quick Crossword No. 10163 link.
All Across Clues and Answers:
1-across – Traitor aiding an occupying enemy force : QUISLING
5-across – Composer of the Brandenburg Concertos : BACH
9-across – Royal Berkshire race-meeting : ASCOT
10-across – Lack of atmosphere : THINAIR
11-across – US constitutional amendments guaranteeing individual freedom : BILLOFRIGHTS
13-across – Sudden : ABRUPT
14-across – Human mind or soul : PSYCHE
17-across – Mid-range female singing voice : MEZZOSOPRANO
20-across – Walked with a limp : HOBBLED
21-across – Model of ethical behaviour : IDEAL
22-across – An intentional disclosure of secret information : LEAK
23-across – Where the ostracised get sent : COVENTRY
All Down Clues and Answers:
1-down – Wharf : QUAY
2-down – More in need of a scratch : ITCHIER
3-down – Leprechauns : LITTLEPEOPLE
4-down – Make known : NOTIFY
6-down – Deluged : AWASH
7-down – Distraught : HARASSED
8-down – The government’s workers : CIVILSERVICE
12-down – Mausoleum at Agra : TAJMAHAL
15-down – Words surrounding a word or phrase that may fix its true meaning : CONTEXT
16-down – Caribbean witchcraft : VOODOO
18-down – Striped equine : ZEBRA
19-down – Become over-sweet : CLOY
This crossword has in total 24 where 12 are across and 12 are down.