Cryptic crossword

ACROSS

3. Going down when at one (2,3,4) 8. Always find the night before right (4) 9. Quite old, but in harmony (7,2) 10. Put in braces? (6) 11. 14. Comfort This proposal with food? is a (5) product of fertile minds (5) 15. Hold your horses! (4) 16. Do they roll out of the confectioner’s? (5) 18. One vehicle taken by terrible Russian (4) 20. Big regal change (5) 21. Bit of quiet, say? (5) 24. Lama in beastly form (6) 25. Defender returning may be immediately (5,4) 26. Standard measure of ammunition (4) 27. A lightning report? (4,5)

DOWN

1. As shown in the trawler fleet’s books? (3,6) 2. Help for the overworked cartographer? (6,3) 4. Really want some fine education (4) 5. There’s an aperture in the wall in that chamber (5)

6. Flying footballer? (6) 7. Negative both ways for a time (4)

9. They offer a change for the driver (5)

11. Tell off 100 who conceal themselves (5)

12. Censure about demure joiner (9)

13. Could be a line I try, actually (2,7)

17. Sneak in order to send about fifty to the bottom (5)

19. When things go wrong? (6)

22. In America, ballot for political clique (5)

23. Capital punishment? (4)

24. The cards they hold in performance? (4)