This crossword No. 589 clues and answers were published on Sun 31 Dec 2006 and the puzzle can be visited by following The Guardian Speedy Crossword No. 589 link.
All Across Clues and Answers:
1-across – Velocity of a plane or missile : AIRSPEED
5-across – Man-eating giant : OGRE
9-across – Book of the Old Testament : HOSEA
10-across – Relating to stretching : TENSILE
11-across – November the First : ALLSAINTSDAY
13-across – Pact : TREATY
14-across – Creatures troublesome to man : VERMIN
17-across – Compiled only by yours truly! : ALLMYOWNWORK
20-across – Chivalrous : GALLANT
21-across – Period of a monarchy : REIGN
22-across – Highly-flavoured : RICH
23-across – Stick or leaf insects that use camouflage : PHASMIDS
All Down Clues and Answers:
1-down – Continuous dull pain : ACHE
2-down – Find the solution : RESOLVE
3-down – Proceeds instinctively : PLAYSITBYEAR
4-down – Demand : ENTAIL
6-down – Abrade : GRIND
7-down – All : EVERYONE
8-down – Put it another way : INOTHERWORDS
12-down – Alien : STRANGER
15-down – Italian renaissance painter : MARTINI
16-down – Change course : SWITCH
18-down – Purplish in colour : LILAC
19-down – Burden : ONUS
This crossword has in total 24 where 12 are across and 12 are down.