This crossword No. 12784 clues and answers were published on Mon 02 May 2011 and the puzzle can be visited by following The Guardian Quick Crossword No. 12784 link.
All Across Clues and Answers:
1-across – Unexpected — terse : ABRUPT
4-across – Arrive — put to shame : SHOWUP
9-across – Formal lesson : LECTURE
10-across – Divide — Croatian port : SPLIT
11-across – Wine or coffee residue : DREGS
12-across – Japanese art of flower arranging : IKEBANA
13-across – Member of English royal house from Henry II to Richard III : PLANTAGENET
18-across – Distorted facial expression : GRIMACE
20-across – Boy’s name : PETER
22-across – Sky blue : AZURE
23-across – To sum up : INAWORD
24-across – Voguish : TRENDY
25-across – Addition that extends a main building : ANNEXE
All Down Clues and Answers:
1-down – Refer : ALLUDE
2-down – Scouting expedition : RECCE
3-down – Young chicken for eating — French painter, d. 1665 : POUSSIN
5-down – Urgency : HASTE
6-down – Financial support for those in need : WELFARE
7-down – Mine worker : PITMAN
8-down – Itinerant : PERIPATETIC
14-down – Use lire : LEISURE
15-down – Elucidate : EXPLAIN
16-down – Stupefied with horror : AGHAST
17-down – Menial servant : DRUDGE
19-down – Alter in detail : AMEND
21-down – Figure of speech — or pet : TROPE
This crossword has in total 26 where 13 are across and 13 are down.