This crossword No. 12518 clues and answers were published on Thu 24 Jun 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12518 link.
All Across Clues and Answers:
1-across – Look after : CAREFOR
8-across – River flowing from Venezuela to the Atlantic : ORINOCO
9-across – Annual publication giving dates of astronomical and other events : ALMANAC
10-across – Start the ball rolling? : KICKOFF
11-across – Alarming, maybe paranormal : SCARY
13-across – Exterior of a plane figure : PERIMETER
15-across – Person one works or spends time with : ASSOCIATE
18-across – Cultural origins : ROOTS
21-across – Publication on single sheet : LEAFLET
22-across – Portable light : LANTERN
23-across – Rubbish : GARBAGE
24-across – Small ungulate : ROEDEER
All Down Clues and Answers:
1-down – Very stupid : CRASS
2-down – Cuban dance : RUMBA
3-down – Odd rather than amusing : FUNNYPECULIAR
4-down – Corker : ROCKER
5-down – Exterior of circle : CIRCUMFERENCE
6-down – Quit a computer system : LOGOUT
7-down – Talk together : CONFER
12-down – Domestic pets : CATS
14-down – Leave the stage : EXIT
15-down – Assert without proof : ALLEGE
16-down – Interior means of ascent : STAIRS
17-down – Horn maybe of 24 : ANTLER
19-down – Excessively fat : OBESE
20-down – System for locating underwater objects : SONAR
This crossword has in total 26 where 12 are across and 14 are down.