This crossword No. 11623 clues and answers were published on Wed 08 Aug 2007 and the puzzle can be visited by following The Guardian Quick Crossword No. 11623 link.
All Across Clues and Answers:
1-across – Brash young man : JACKTHELAD
7-across – Quarter of a circle : QUADRANT
8-across – Intestines : GUTS
9-across – Converse : TALK
10-across – Place where metal is extracted from ore by heating : SMELTER
12-across – Sudden severe cardiac malfunction : HEARTATTACK
14-across – Developing in small steps : GRADUAL
16-across – Sight – site : SPOT
19-across – Small blood-sucking insect : FLEA
20-across – Abstaining from alcohol : TEETOTAL
21-across – Narrow escape : CLOSESHAVE
All Down Clues and Answers:
1-down – Encounter between two mounted knights at tourney : JOUST
2-down – Small mark placed below C in Portuguese and Catalan, for example : CEDILLA
3-down – Snare : TRAP
4-down – Calculate roughly : ESTIMATE
5-down – Divine messenger : ANGEL
6-down – Irregular contrasting stripe : STREAK
11-down – Legendary lost island : ATLANTIS
12-down – Proceed quickly and noisily : HURTLE
13-down – Ancient two-handled jar : AMPHORA
15-down – Slow, protracted way of speaking : DRAWL
17-down – Tantalise : TEASE
18-down – Not so much : LESS
This crossword has in total 23 where 11 are across and 12 are down.