This crossword No. 11404 clues and answers were published on Thu 23 Nov 2006 and the puzzle can be visited by following The Guardian Quick Crossword No. 11404 link.
All Across Clues and Answers:
1-across – Tough : HARDBOILED
7-across – Rodent renowned for mass migration : LEMMING
8-across – Instrumental part at start of song : INTRO
10-across – Alkaline substance used in cleaning, drinks etc : SODA
11-across – Run : SEQUENCE
13-across – Anti-aircraft cannon – woolly ball : POMPOM
15-across – Immobile : STATIC
17-across – Inability to sleep : INSOMNIA
18-across – Hindu philosophy involving mental and physical exercise : YOGA
21-across – Industrial city in northwest Italy : TURIN
22-across – Fish that’s kippered : HERRING
23-across – Air : ATMOSPHERE
All Down Clues and Answers:
1-down – Moist : HUMID
2-down – Control for horse : REIN
3-down – Bell/tower of Houses of Parliament : BIGBEN
4-down – Wickedness : INIQUITY
5-down – Having died out : EXTINCT
6-down – Critical moment when trouble flares : FLASHPOINT
9-down – Demand too high a price : OVERCHARGE
12-down – Member of special military unit : COMMANDO
14-down – Beaver-like American rodent : MUSKRAT
16-down – High-ranking clergyman : BISHOP
19-down – Sheep-like : OVINE
20-down – Unfettered : FREE
This crossword has in total 24 where 12 are across and 12 are down.