Cryptic crossword

ACROSS 1. Cell where super clock hasn’t finished working (9) 5. Alphabet in the wrong order where truck driver is concerned (3) 7. It has its highs and lows at the seaside (4) 8. Instrument used in entering Bordeaux (8)

10. Passage to the bullfight doesn’t finish with gold (8)

11. The head runner (4)

13. A flag leaderless folk will put their name to (6)

15. A changeover in false hair (6)

18. Class will take shape (4)

19. A bear, old as it is, is very lovable (8)

22. I care not about response (8)

23. Hard-sounding volcanic rock (4)

24. Staying silent, one may act in dumbshow (3) 25. Miraculous way it flew round (9)

DOWN

1. Outer layer of skin sliced as lice are shifted (7)

2. A palindromic aid to navigation (5)

3. First chief to let one appear unbearded (6)

4. In the crude form of linen before bleaching (4)

5. One’s agreement to different NCO being posted (7)

6. Keep going at the wicket as conductor takes one in hand (5) 9. Non-u genius might make things too hot for one (5)

12. Is under oath to give up arguments and start negotiations (5) 14. Language of contempt for cars as misused on motorway (7) 16. Taking due notice of fuel he’d chopped up (7)

17. Be next to head he left to become a member (6) 18. Discussion meeting the Foreign Office finds odd (5) 20. Being so outspoken may deceive one (5)

21. Pack it in with sulphur and fibres of flax (4)