This crossword No. 12519 clues and answers were published on Fri 25 Jun 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12519 link.
All Across Clues and Answers:
1-across – Worker on tall structures : STEEPLEJACK
9-across – Croatian resort : DUBROVNIK
10-across – Tree : ASH
11-across – Boredom : ENNUI
13-across – US university : CORNELL
14-across – Piece of crockery, maybe flying : SAUCER
15-across – Remains of coal fire : EMBERS
18-across – Attains : REACHES
20-across – Confess : OWNUP
21-across – Organism protected by shell : EGG
22-across – Sharpener : WHETSTONE
24-across – Hero of fantasy books : HARRYPOTTER
All Down Clues and Answers:
2-down – Small flap : TAB
3-down – Stimulating to feelings : EMOTIVE
4-down – Madness : LUNACY
5-down – Wild card : JOKER
6-down – Animal that changes colour : CHAMELEON
7-down – Enemies : ADVERSARIES
8-down – Thinker with stone associated with 24 : PHILOSOPHER
12-down – Nerve pain : NEURALGIA
16-down – When satellite goes down : MOONSET
17-down – Having nodded off : ASLEEP
19-down – Person cutting : HEWER
23-down – Poem : ODE
This crossword has in total 24 where 12 are across and 12 are down.