8  Stake a chess piece (4)

 9  Troubled scholar, from time to time, worrier - a greenie (3-7)

10 Unruly mob struggle losing ground at first (6)

11 Many in number cross about liberal hint (8)

12 US bird's short jerky movement over golf course mostly (8)

14 Coins kind son dropped (6)

16 Lie around after following small body of soldiers (4)

17 Level a tree (5)

18 Select part of topic knowingly (4)

19 Woodlouse locally essentially vanishing some time in the future (6)

21 Sadly I'm leftie for duration of existence (8)

23 Indirect answers of disconcerted rector quitting badly managed conservatories (8)

26 Bug Ringo, say, on the phone (6)

27 Small currant bun; Spike Milligan's delicacy? (6,4)

28 Female leaving one musical instrument for another (4)

 2  Eleven, perhaps, in single file (3,2,3)

 3  The old folk, originally indigenous Gulf inhabitants (6)

 4  Diver's money at bottom of bog (4)

 5  Cumbrian city's beginning of car rallies in a turmoil (8)

 6  Fine to produce strawberry brandy or bacon pancake (6)

 7  An act of rotating or reversing lines (4)

13 Adult in frolic overturning village of huts (5)

15 Unfinished during brief competition, allowed time finally (10)

17 Aquatic mammal's power or graceful carriage (8)

18 Petty Officer on telly, clutching top of bulging paunch (8)

20 Struggle of tense American golfer making a comeback (6)

22 Famous sailor escaped guards (6)

24 In place of old winding stair (4)

25 Overturned cooking utensils suddenly break (4)