Cryptic crossword

ACROSS

1. Fly away with a Russian fighter at some speed (7)

5. Making other contents that may be precious (5)

8. Not being self-sufficient, learn it and adapt (7)

9. Set of examination questions that may go to the wall (5)

10. Settle down to it at getting swallowed up in earnest (9)

12. Day that is shortly cast, maybe (3)

13. In grammar it is time to be stretched tight (5)

17. Car with this behind attractive to donkey? Rubbish! (3)

19. Swing to Conservative is a positive change of direction (5,4)

21. It gives one a view by way of its taking in the street (5)

22. Tend towards a hill that’s gentle (7)

24. Bits of pipes one stops flowing (5)

25. Said one’s first words with tears in Scotland (7)

DOWN

1. What one may see is not actually there (6)

2. Pig swallowing tail up - he’s gigantic! (7)

3. Collected sayings taken from a Victorian anthology (3)

4. Man delivering over doesn’t want it to be something over (5)

5. Piece of equipment one may give effect to (9)

6. Space between Epsom and Downs initially was yawning (5)

7. Small round shield may be shot at for practice (6)

11. Differences in pitch for times when there’s no play (9)

14. Journey-man, perhaps, is tutor – only different (7)

15. Turns out to be over-confusing in afterthought (6)

16. Mean to be at home to look after things (6)

18. The flavour of perception that’s nice (5)

20. Current medal has one in its middle (5)

23. How letter is written may indicate one should begin (3)