Cryptic crossword

ACROSS 1. A fresh time for dreamy synthesizer music (3,3)

4. Had seen camp laid out for the astronauts (8)

9. Nothing unusual about Roman fifty (6)

10. Is sounding surly at getting entangled (8)

12. The signing on of ten men or fifty, perhaps (9)

13. It’s not hidden on top of tank-top (5)

14. It’s true a banner’s been prepared for the underground (12) 18. Lady principal hides, masters being around (12)

21. Some of the water in separator is used to remove the soap (5)

22. A chemical salt can be tar — no different (9)

24. Pan Latin uses for banana (8)

25. Left without help from raft, I’d wandered (6)

26. A lump it’s well to give voice about (8)

27. Doctor, having done wrong, sounded monotonous (6) DOWN 1. No such rubbish is without frills (8)

2. Bare word needed for all the clothes one’s got (8) 3. A girl set out to find the holy platter (5)

5. One, pretty inane, taken to prison in America (12) 6. Bird can motor around, right? (9)

7. I’d name for it with no runs scored (6)

8. Nullify, for example, neat arrangement (6)

11. A print concerning the making of a film (12) 15. A nature spirit made Lee crazy (9)

16. The calming is done as it may appear (8)

17. Agreed to end as set was built for it (8)

19. Fruit fired hot from old cannon (6)

20. Lest it shows how lawyers are involved (2,4) 23. The neatness of Bath, say (5)