This crossword No. 12636 clues and answers were published on Tue 09 Nov 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12636 link.
All Across Clues and Answers:
5-across – Easily annoyed : BADTEMPERED
7-across – Rope bracing a mast etc : STAY
8-across – Hairdresser : COIFFEUR
9-across – Frightful : HIDEOUS
11-across – Young mare : FILLY
13-across – ___ Nash, American poet : OGDEN
14-across – Extreme satisfaction : DELIGHT
16-across – Covers for a window : SHUTTERS
17-across – Turn from side to side : ROLL
18-across – Source of extensive but unforeseen troubles : PANDORASBOX
All Down Clues and Answers:
1-down – 6 June 1944 : DDAY
2-down – Sauce made largely of tomatoes : KETCHUP
3-down – Device for dispensing measures of spirits : OPTIC
4-down – Scribblings on the walls of buildings : GRAFFITI
5-down – Bookmaker’s premises not on a racecourse : BETTINGSHOP
6-down – Shape of a DNA molecule : DOUBLEHELIX
10-down – Equestrian competition : EVENTING
12-down – Lustful : SENSUAL
15-down – Broom made from twigs tied to a handle : BESOM
17-down – Gemstone comprising mainly aluminium oxide : RUBY
This crossword has in total 20 where 10 are across and 10 are down.