1 Muslims or Arabs at the time of the Crusades (8)
6 Classic Gershwin song from 'Porgy and Bess' (10)
11 Trained cook of the highest class (6,4)
12 Kilted Highlanders' pouches (8)
13 Poisonous alkaloid in tobacco (8)
14 Measure of an engine's output (10)
15/27 Crossed by day-trippers in the Pacific? (13,8)
18 Controversial modern British artist, won 1995 Turner prize with 'Mother and Child Divided' (5)
20 Sort of bars favoured by gymnasts? (8)
23 Total loss of strength and vitality (10)
24 Script of a film (10)
27 See 15
29 Swiss mountain peak famed for its north face (5)
30 Smash musical from a Victor Hugo novel (3,10)
34 Italian director of 'Last Tango in Paris' (10)
36 Competent in mathematics (8)
38 Hard reddish-brown wood (8)
39 Impulsive fire-starter (10)
40 US composer and lyricist of 'Begin the Beguine' (4,6)
41 Person with a special appreciation of beauty (8)

2 Kind of harp played by the wind (7)
3 Constellation named after mythical Greek princess (9)
4 Boredom (5)
5 In credit (7)
6 End of the Earth's axis in Antartica (5,4)
7 Avaricious person (5)
8 French-built, short-range guided missile (6)
9 One who uses violence for political coercion (9)
10 Composer of 'Fingal's Cave' overture (11)
16 Sheer stockings (6)
17 Sap-sucking insect (5)
19 General killed at the Battle of Little Bighorn (6)
21 Group of usually volcanic islands (11)
22 De Gaulle's birthplace (5)
25 Terminal conductor of electricity (9)
26 Jewish day of fasting (3,6)
28 Maze, home to the mythical Greek Minotaur (9)
31 Spanish red wine diluted with fruit juices etc. (7)
32 Short passage taken from a book, etc. (7)
33 Texan city on Mexican border (2,4)
35 Church vault used for burial (5)
37 Infectious disease affecting salivary glands (5)