This crossword No. 10599 clues and answers were published on Mon 26 Apr 2004 and the puzzle can be visited by following The Guardian Quick Crossword No. 10599 link.
All Across Clues and Answers:
1-across – Type of arch : TRIUMPHAL
8-across – Field of combat : ARENA
9-across – Show disapproval of – military quarters : BARRACK
10-across – Means of putting screw in wall : RAWLPLUG
11-across – Breeding establishment : STUD
13-across – The largest one in the 5 : WINDER
14-across – Vex – pester : HARASS
16-across – US state : IOWA
17-across – Rail passenger, nowadays : CUSTOMER
19-across – Automobile city : DETROIT
20-across – One with a low view of human nature : CYNIC
21-across – Possible but unexpected winner? : DARKHORSE
All Down Clues and Answers:
1-down – Trodden underfoot : TRAMPLED
2-down – : INBLUE
3-down – See 13 : MERE
4-down – Making one feel good : HEARTWARMING
5-down – National Park : LAKEDISTRICT
6-down – Bigoted and prejudiced : NARROWMINDED
7-down – Drew new treat : DERWENTWATER
12-down – Minute piece of matter : PARTICLE
15-down – Fat : BUTTER
18-down – Insect : MOTH
This crossword has in total 22 where 12 are across and 10 are down.