This crossword No. 11503 clues and answers were published on Wed 21 Mar 2007 and the puzzle can be visited by following The Guardian Quick Crossword No. 11503 link.
All Across Clues and Answers:
5-across – Poet of World War I : WILFREDOWEN
7-across – Emperor : TSAR
8-across – : PLUSSIGN
9-across – Fish, often kippered : HERRING
11-across – Obscene – unfair : DIRTY
13-across – Soviet Union’s first premier : LENIN
14-across – Seemingly inexplicable : UNCANNY
16-across – Spitfire designer – author of ‘Gone With The Wind’ : MITCHELL
17-across – Scottish port : OBAN
18-across – Scottish region and university : STRATHCLYDE
All Down Clues and Answers:
1-down – Slight – stain : SLUR
2-down – Gas used as fuel : PROPANE
3-down – Smell : ODOUR
4-down – Nazi symbol : SWASTIKA
5-down – Launderettes : WASHETERIAS
6-down – Songbird : NIGHTINGALE
10-down – Warrant for cheaper travel : RAILCARD
12-down – Impose : INFLICT
15-down – Bed in ship or train : BERTH
17-down – Gemstone : ONYX
This crossword has in total 20 where 10 are across and 10 are down.