Cryptic crossword

ACROSS

1. Track built over creek and round the bend (5)

4. Administrative division returned identification, observing exact rules (8)

8. Flighty singer in a duet changed position? (8)

9. Excellent performer holding back last month’s yield (6)

10. Stretch out a hand after bishop’s transgression (6)

11. What a golfer might shoot at in sight is distinct (8)

12. A character leading team inside sounded stunned (9)

14. Normal seaman missing mother at sea (4)

16. Large Internet Service Provider’s computer programming language (4)

18. Related people and I have invested in sister’s underwater explorer (4-5)

21. Highly sophisticated speed popped by smart man (5-3)

23. Time-consuming dust remover reportedly is European

(6)

24. Complete a short distance covered by swimmers (6)

25. Drainage interfered with plant that produces perfumed flowers (8)

26. Army sections prepared to fight as bridge exploded (8)

27. Met about musical time (5)

DOWN

1. Extra wait spoiled harbour transport (5,4)

2. One bit included at the end of class’s computer graphics (4,3)

3. Try out hostel providing shelter for teenagers (5)

4. Applied manure to garden and drive, and scattered seeds (7)

5. Made an impression before journalist charged (9)

6. Musical productions are, according to audience, scored badly (7)

7. Military trainee caught kissing date out of uniform (5)

13. Vessel kept in UN storage facility in one piece (9)

15. River boatman popped up in simple story (9)

17. Getting ready to leave crown picked up by king (7)

19. Last member of foursome, locked in cage, is tortured with long periods of very low temperatures (3,4)

20. Powerful head of network transmitted in colour (7)

22. Former religious leader (5)

23. Packed assembly specified problem about creditor? (5)