This crossword No. 820 clues and answers were published on Sun 05 Jun 2011 and the puzzle can be visited by following The Guardian Speedy Crossword No. 820 link.
All Across Clues and Answers:
1-across – Accepted humiliation : ATEHUMBLEPIE
9-across – Approaches : NEARS
10-across – Improper, wicked or immoral behaviour : MISDEED
11-across – Lift or hold something to assess its weight : HEFT
12-across – To deafen? : TONEDEAF
14-across – Naked : UNCLAD
15-across – Significant language of Belgium, Switzerland and Canada : FRENCH
18-across – Fibrous mineral, used as an insulator, now deemed harmful : ASBESTOS
20-across – Knitting stitch : PURL
22-across – Spoiled the appearance of : DEFACED
23-across – Grey or white long-legged wading bird : HERON
24-across – Ironic expression of disbelief or impossibility : PIGSMIGHTFLY
All Down Clues and Answers:
2-down – Trade : TRAFFIC
3-down – Metal fastener : HASP
4-down – Wealth regarded as an evil influence : MAMMON
5-down – Old Cornish stannary and market town : LISKEARD
6-down – Irritate : PEEVE
7-down – Point beyond which it is useless or impossible to proceed : ENDOFTHELINE
8-down – Steadily improving : ONTHEUPANDUP
13-down – Sweet red or green pepper : CAPSICUM
16-down – Having no decided colour : NEUTRAL
17-down – Leader of a group : TOPDOG
19-down – Obscure : BEFOG
21-down – Out of business : SHUT
This crossword has in total 24 where 12 are across and 12 are down.