This crossword No. 556 clues and answers were published on Sun 14 May 2006 and the puzzle can be visited by following The Guardian Speedy Crossword No. 556 link.
All Across Clues and Answers:
5-across – Schedule : TIMETABLE
8-across – Worry : FRET
9-across – Gloomy : OVERCAST
10-across – Add, annex : APPEND
11-across – Ape-like : SIMIAN
13-across – Small private room : CLOSET
15-across – Wax light : CANDLE
16-across – Swampy marsh : QUAGMIRE
18-across – Gaping wound : GASH
19-across – Curse, profane : BLASPHEME
All Down Clues and Answers:
1-down – Sadden : DISTRESS
2-down – See, observe : BEHOLD
3-down – Fondle, stroke : CARESS
4-down – Political coalition : BLOC
6-down – Suffering from drunkenness : CRAPULOUS
7-down – Found : ESTABLISH
12-down – Having one partner : MONOGAMY
14-down – Craving : THIRST
15-down – Day nursery : CRECHE
17-down – Bitterness : GALL
This crossword has in total 20 where 10 are across and 10 are down.