Cryptic crossword - The Scotsman 10/01/15

ACROSS

1 Prudence, do swim round (6)

4 Mark going to town where there’s a shortage (8)

9 His parents are late (6)

10 Fidgety girl grew into twister (8)

12 Such a development is not accidental (7-5)

15 Many an up-to-date movement causing sudden uprising (4,5)

17 Put me next to the subject (5)

18 Snake leaps out! (5)

19 Colourful crest in the Appalachian Mountains (4,5)

20 Hamlet’s fool (7,5)

24 Looking both ways? That’s hypocritical (3-5)

25 Three-quarters of state had not been touched (6)

26 Disagreed with fourth fifer confusing Edward (8)

27 Attack command (6)

DOWN

1 Bird would, so to speak, eat sparingly and hesitantly (10)

2 Exceptional being who’s bionic (10)

3 Go to a revolutionary part of New Zealand (5)

5 Arbiter in the loop? (7,5)

6 Controlling device to be included at frequent intervals (9)

7 Man lies outrageously (4)

8 Roy turned up with Ecstasy long time ago (4)

11 Induced to become religious (3,2,7)

13 Someone who looks exactly like late campanologist (4,6)

14 Remorse concerning punishment, about time (10)

16 Is to drink slowly in time and disperse (9)

21 In lair I shielded this terrier (5)

22 No end of room for horses (4)

23 Predator has run up (4)