4  Slim poll leads change shipping line (8)

10 Tram flops around trains here (9)

11 Regularly thawing car in Siberian forest (5)

12 Suspend coins having no edges (4)

13 I put my foot in it casting spell I read (10)

15 Flowers put shelter back for four people dancing (7)

16 Pieces set on board ship (6)

19 Hot cake a pound lighter (6)

21 Menacing bouncer taking notice of you at last (7)

23 Mountain I'm blowing up with weaponry (10)

25 Fuel source maybe winning back politician (4)

27 Small flyer backing the Spanish couple going out (5)

28 Cathedral's direction healthy (9)

29 Whose flannel wash essentially results in joyful cries? (8)

30 Drink with clergyman goes faster (4,2)

 1  Piece of software acquired by county is a gem (8)

 2  Extremely clever bear isn't one to get confused (9)

 3  Sonically testing volcanic rock (4)

 5  Oriental sailors confined by Douglas Carswell (7)

 6  Significantly, teacher leaving school has one supporter (10)

 7  Role I play in college (5)

 8  Brewing ale for one does nothing (6)

 9  Understands German files (6)

14 Point at John, say, eating fish in old aircraft (10)

17 Disagrees about American hairdryer attachments (9)

18 After crossing line, facetious dandy to have a change of heart (4-4)

20 Name of Russian woman at a shampooer's (7)

21 Belgium out of control, in a manner of speaking (6)

22 Good look into wood overshoe (6)

24 Considers electronic replacement for large pack animals (5)

26 Woman taking over - many examples here (4)