This crossword No. 12786 clues and answers were published on Wed 04 May 2011 and the puzzle can be visited by following The Guardian Quick Crossword No. 12786 link.
All Across Clues and Answers:
1-across – Prepare for action : CLEARTHEDECKS
8-across – Racing certainty : NAP
9-across – Substance supposedly emanating from the body of a medium during trances : ECTOPLASM
10-across – Object passed down through a family for generations : HEIRLOOM
11-across – Flashy black marketeer : SPIV
13-across – Short railway track for shunting : SIDING
14-across – Acrimonious : BITTER
16-across – Affluent : RICH
17-across – Largest city in China : SHANGHAI
20-across – Harmony : AGREEMENT
21-across – Winged insect : BEE
22-across – New England state : MASSACHUSETTS
All Down Clues and Answers:
1-down – Easy task : CINCH
2-down – Feeling of pride and loyalty shared by members of a group : ESPRITDECORPS
3-down – Dry white wine : RIESLING
4-down – Car radically modified to increase performance : HOTROD
5-down – Stupid : DOPY
6-down – Be impatient to act : CHAMPATTHEBIT
7-down – Russian tea urn : SAMOVAR
12-down – Condition in which there is constant ringing in the ears : TINNITUS
13-down – Harsh or bitter derision or irony : SARCASM
15-down – Exclamation of disbelief : OHYEAH
18-down – Smite : ITEMS
19-down – Flat-topped hill with steep sides, common in the southwestern US : MESA
This crossword has in total 24 where 12 are across and 12 are down.