Cryptic crossword - The Scotsman 03/03/15

ACROSS

1 Murdered lawyer dressed in fine material (4,4)

5 Two English people in Australia at decorative ball (6)

9 Balls bowled when it was looking like rain (8)

10 Zealous get diet-related ailment when they eat too much (3,3)

12 Make a hole in bit that goes round original receiver (6)

13 Ill-will needed to make mark in Home Counties (5)

16 Obliterated periods of schooling (6)

17 Item of clothing thrown into river on significant birthday (8)

20 Walk with keen companion, we hear, to Welsh town (4)

21 Agree to take prisoner with dog (6)

23 Tycoon reported in Scotland to have not a shilling (5)

25 Give more problems to puzzle setter (6)

28 Wound treatment discovered where ten are eating (6)

29 Problem relating to mathematical function (8)

30 Make fun of how stupid leader may come to be (4,2)

31 Etruscan converted to become dissenter (8)

DOWN

1 Saint welcomes company of countryman (4)

2 Redo upstream in river (4)

3 Violation of play by eg Sir Alec (9)

4 Result of spoiling gloss (6)

6 So Timothy comes in to uphold what he leaves out (5)

7 Rhode Island port in which to find God? (10)

8 Stuff with some brass on mountain (10)

11 Little dog sees nothing in black tea (5)

14 Die in stews, horribly, in the Caribbean (4,6)

15 Twice instructed someone by name to go to spa town (5-5)

18 The first Swiss philosopher to have collected bride’s clothes (9)

19 Being black and sticky makes one hang on for a while (5)

22 Position where nationalists go back to church (6)

24 Rule out Tuesday in brief for meeting African people (5)

26 Killer whale anchor caught in passing (4)

27 Please work overtime on site (4)