Cryptic crossword - The Scotsman 13/12/2011

Across

1 Large creatures I leave to injure insects (8)

5 From old king to crazy cat (6)

9 It makes one hold one’s breath to work out the cost, I hear (8)

10 Boxer, for example, encountered outside fair booth (6)

12 Would like a small number to surround a victor (6)

13 Left out request for pudding (5)

16 Walk-on parts combine art with sex (6)

17 Set gnome to unearth diamond, say (8)

20 Ignored uncertainty reported on air (5,3)

21 With PR, one’s made out to be human (6)

23 Send back either way (5)

25 Hypocrisy is taking the stage in province (6)

28 Fliers remain indisposed (6)

29 Critical speech is a bit dire as composed (8)

30 Alien immersed in, for example, bass obsession (6)

31 Sensible about container for waste (8)

Down

1 Large number request disguise (4)

2 The majority of doctors take turns at first (4)

3 and 4 Did they go to cut grass or herd sheep? (3,3,3,3,3)

6 Mashed potato’s a winner (5)

7 and 22 An arsonist does famously (4,1,5,2,4)

8 Sterling old bit of opera (10)

11 If red, cooked and cooked (5)

14 Spouse preferable to none at all, you might think (6,4)

15 Countenance the National Anthem? (5,3,2)

18 and 19 Put one’s foot on orange, for example, and let it rip (4,2,3,5)

22 See 7

24 Studies so-called rushes (5)

26 Keen to make a comeback as prima donna (4)

27 Once decided to give up, let go (4)