4  Mysterious remote flash in the sky (6)

 8  Swiss hero wearing short Indian dress? That's extraordinary! (7)

10 Every animal's reputed to have origins here (5)

11 Goddess with heavenly body (5)

12 Spacers flying astronomical distances (7)

13 Demanding redesign can be infuriating (9)

18 Travels through quiet Irish lakes (7)

21 Small step leads to where one may boldly go (5)

22 Notes resistance to sort of renewable energy (5)

23 Newspaper regular feature identifies warm holiday resort (7)

24 Removing core from sappy branch is standard procedure (6)

25 Lorry, not large, carrying queen's clockwork astronomical model (6)

 1  Staple food from Africa savannah (6)

 2  Seabird, in addition, has breastbone (7)

 3  Will, losing his head, took drugs after being badly treated (3-4)

 5  Ruler your setter looks up to - always (5)

 6  Mountain retreat is reportedly strangely frightening (5)

 7  Hears about Handel's first reuse of old material (6)

 9  Checks on printers (9)

14 In hospital for convalescents Earl, oddly, becomes crazier (7)

15 Get hold of Greek fruit (7)

16 Potential spouse works (6)

17 Guard stood at southern gate (6)

19 Some damsel going climbing gets lascivious looks (5)

20 Son covered in blood after falling into this? (5)