This crossword No. 9425 clues and answers were published on Mon 17 Jul 2000 and the puzzle can be visited by following The Guardian Quick Crossword No. 9425 link.
All Across Clues and Answers:
1-across – Painting, maybe a Turner : SEASCAPE
5-across – Cooing bird : WOOD
9-across – Identifying tag : LABEL
10-across – Ancient king who made a knot : GORDIUS
11-across – Area containing ozone layer : STRATOSPHERE
13-across – Edna, novelist : OBRIEN
14-across – A liquid hydrocarbon found in petroleum : OCTANE
17-across – Tall, portable light : STANDARDLAMP
20-across – Letter carrier : MAILVAN
21-across – Bury : INTER
22-across – Marsh plant – hurry! : RUSH
23-across – Maternal : MOTHERLY
All Down Clues and Answers:
1-down – Seasoning : SALT
2-down – Referee : ARBITER
3-down – Rival to the 5 4 : COLLAREDDOVE
4-down – See 5 : PIGEON
6-down – Say what one thinks : OPINE
7-down – Cut apart : DISSEVER
8-down – We keep them in tanks : TROPICALFISH
12-down – Threads from spiders : GOSSAMER
15-down – It measures current : AMMETER
16-down – Right away : PRONTO
18-down – : AMISS
19-down – Wear away at the edges : FRAY
This crossword has in total 24 where 12 are across and 12 are down.