This crossword No. 11754 clues and answers were published on Thu 10 Jan 2008 and the puzzle can be visited by following The Guardian Quick Crossword No. 11754 link.
All Across Clues and Answers:
1-across – Knocking bird : WOODPECKER
7-across – Type of drink restoring body fluids and salts : ISOTONIC
8-across – Fight to the death between two people : DUEL
9-across – Long heroic poem : EPIC
10-across – Bird – dog – plane : HARRIER
12-across – ‘Swan Lake’ composer : TCHAIKOVSKY
14-across – Bird of the Antarctic : PENGUIN
16-across – Bird – caper : LARK
19-across – Bird of peace : DOVE
20-across – Rinsing the mouth with medicinal fluid, while breathing out through the liquid : GARGLING
21-across – Footpath along the backbone of England : PENNINEWAY
All Down Clues and Answers:
1-down – Refuse : WASTE
2-down – Bird burying its head in the sand : OSTRICH
3-down – Gasp for breath : PANT
4-down – Bird, a type of parrot : COCKATOO
5-down – Woody shrub – used for wine, tea or cordial : ELDER
6-down – Cure : REMEDY
11-down – Throwing in the towel : GIVINGIN
12-down – Minor earthquake : TREMOR
13-down – Bird – gulp down : SWALLOW
15-down – Freshwater diving bird : GREBE
17-down – Given to deviant sexual practices : KINKY
18-down – Bird – architect, 1632-1723 : WREN
This crossword has in total 23 where 11 are across and 12 are down.