This crossword No. 12000 clues and answers were published on Thu 23 Oct 2008 and the puzzle can be visited by following The Guardian Quick Crossword No. 12000 link.
All Across Clues and Answers:
1-across – Mouth-to-mouth resuscitation : KISSOFLIFE
7-across – Ostentatious exhibitionist : SHOWOFF
8-across – Buddhist concept of inevitable consequence : KARMA
10-across – Inclination – dissolute man : RAKE
11-across – Intimidate : BROWBEAT
13-across – Stinging weed : NETTLE
15-across – Cavity formed by explosion : CRATER
17-across – Sedative derived from opium : MORPHINE
18-across – Study intensively : SWOT
21-across – Small particle of bread : CRUMB
22-across – Condition in agreement : PROVISO
23-across – Address, name etc printed at top of notepaper : LETTERHEAD
All Down Clues and Answers:
1-down – Booth : KIOSK
2-down – Not fast : SLOW
3-down – University city : OXFORD
4-down – Tepid : LUKEWARM
5-down – Undergo chemical reaction such as when sugar turns to alcohol : FERMENT
6-down – Incredibly large – so romantic : ASTRONOMIC
9-down – Change : ALTERATION
12-down – Set of letters used in writing : ALPHABET
14-down – Deliberately inflict severe pain for some purpose : TORTURE
16-down – Rifleman firing from concealed location : SNIPER
19-down – Uncanny : WEIRD
20-down – Bird of peace : DOVE
This crossword has in total 24 where 12 are across and 12 are down.