5  Cautious but barbed imitation backfired somewhat (5)

 8  It turns in either direction (5)

 9  Collects donkeys in the morning? (7)

10 Comprehensive fees gathered together for highways (13)

11 South Pole in the dark when the North Pole is this? (6)

12 Picks up pound onboard ship (6)

15 Vague tea-time/dinner arrangement (13)

18 Fitting handle takes expert (7)

19 Hotel winds down (5)

20 Litigate against India's children (5)

21 Basic fencing around good man's paradise (7)

 1  Turned back sheets for little swimmer (5)

 2  Lasted longer but not in the west or the north (7)

 3  Time in charge of desk where every element is written down (8,5)

 4  Fruit of round variety (6)

 5  Three of them working together on the road might direct you to smuggle flimsy seconds (7,6)

 6  Sir hasn't got time for penny-pincher (5)

 7  Stops crazy headmistress leaving Byzantine harem (7)

11 "Spurs break limits," admit United (7)

13 Instrument essential to turbo car in autopilot (7)

14 Nation's dripping in conversation (6)

16 Contests expected to get extremely ludicrous (5)

17 Points, perhaps, for study (5)