This crossword No. 12664 clues and answers were published on Sat 11 Dec 2010 and the puzzle can be visited by following The Guardian Quick Crossword No. 12664 link.
All Across Clues and Answers:
1-across – Strong objection or opposition : RECALCITRANCE
8-across – Kind of cormorant — tobacco : SHAG
9-across – Musical instrument like a flat box, with a sounding box : DULCIMER
10-across – Horn of plenty : CORNUCOPIA
12-across – Five cent piece : NICKEL
14-across – Something added to the start of a word — title before a name : PREFIX
15-across – Small door or entrance within a larger one : WICKETGATE
19-across – Banter : BADINAGE
20-across – Inert gas : NEON
21-across – Fungus causing hallucinations : MAGICMUSHROOM
All Down Clues and Answers:
2-down – Country in the Horn of Africa : ETHIOPIA
3-down – Inert gas : ARGON
4-down – Will supplement : CODICIL
5-down – Dutch bulb? : TULIP
6-down – Stir : AGITATE
7-down – Masticate : CHEW
11-down – Master of musical technique : VIRTUOSO
13-down – Native of a Gulf state : KUWAITI
14-down – Lady of verse : POETESS
16-down – Abyss : CHASM
17-down – Something beyond any chance of recovery : GONER
18-down – Body of legend : SAGA
This crossword has in total 22 where 10 are across and 12 are down.