This crossword No. 12856 clues and answers were published on Mon 25 Jul 2011 and the puzzle can be visited by following The Guardian Quick Crossword No. 12856 link.
All Across Clues and Answers:
1-across – Tune : MELODY
4-across – Bowed : ARCHED
9-across – Based on 10 : DECIMAL
10-across – Parts of speech : VERBS
11-across – ____, Macduff! : LAYON
12-across – Unfeeling : CALLOUS
13-across – Agent for buying and selling securities : STOCKBROKER
18-across – Prophet of overpopulation, d.1834 : MALTHUS
20-across – Absorbent cloth : TOWEL
22-across – Striped horse : ZEBRA
23-across – Ban : EMBARGO
24-across – 17th-century poet : DRYDEN
25-across – Attractive — quite : PRETTY
All Down Clues and Answers:
1-down – Complete part : MODULE
2-down – Fortunate : LUCKY
3-down – As if possessed by devil : DEMONIC
5-down – Competitor : RIVAL
6-down – Secretion affecting behaviour : HORMONE
7-down – Neglect : DISUSE
8-down – Large and forceful film, person etc : BLOCKBUSTER
14-down – Chests of drawers, one on top of the other : TALLBOY
15-down – To be orc : OCTOBER
16-down – Gobsmacked : AMAZED
17-down – ____ but unbowed : BLOODY
19-down – Throw with force — retch : HEAVE
21-down – German sausage : WURST
This crossword has in total 26 where 13 are across and 13 are down.