1: Some people differ about Castro (5)

4: Sulfur and a bit of slime ring sedimentary formation(9)

9: Bar mail of unadorned capital (5,6)

10: Heavy metal group X (4)

11: Club with space for some money (3)

12: Privy to accessibility (11)

13: Vapour trapped in paste amethyst (5)

15: Style of western pasta (9)

17: Greg is stone-faced, in sum? (9)

18: Fiber extracted from thistles (5)

19: Thats sensible; has the eagle perhaps landed? (4-2-5)

22: Five kills one. (3)

24: Mr Stewart on the staff (3)

25: A favourite car of Seattle natives. (11)

27: Form of address valued for the auditor taken unawares (9)

28: A couple upset after end of big cheese (5)

2: Road leading into dismal swamp (5)

3: Telekinesis pinches Albanian coin (3)

4: Firm rear end (5)

5: Remote and barbarous Irish school (5,4)

6: Tag his shirt in order to discover if he's only a little bent. (11)

7: Frequently decimal? (5)

8: Unnecessary oath from ex-president I've allowed in (9)

9: Sounds like a wolf on the coast (3)

12: Exciting moment, actor as reviewer (11)

13: Sad, sad strands of Gershwin tunes, for instance (9)

14: Encourage horse led with direction. (3)

15: Secret Service obtaining fast food for surveillance jobs (9)

16: Worthless even when recycled (3)

20: More extensive extra, right? (5)

21: Made new, breaking away from tired ideas (5)

22: Farewell from union leader after getting something straight (5)

23: Uninitiated stoop to finish (3)

26: Cleaning aid possessed by Fragonard (3)