Cryptic crossword

ACROSS

1. Mimi, a heartless nag, is playing dumb (6)

4. An afterthought to charity, as booked in the Old Testament (6) 9. Mean to put name to it, if starting Yule (7)

10. Fatuous way cousin, a ne’er-do-well, shows it (5)

11. Great story of early practice beginners, on the ice endlessly (4) 12. Part of fastener has first bit of polish applied (4)

13. Small child will get something out of the rubbish (3) 15. Yellow youth-leader gets 21 to lose their head (4)

16. Don’t go on with the descent by parachute (4) 19. Apprehend the return of prohibition (3)

21. Sort of song-people (4)

22. Courses are used in making up a line of footballers (4) 24. Out of bed, get solid that may unsettle one (5) 25. Incomplete score may have tune for one in The Pirates (7) 26. Is off in one’s bed, usually (6)

27. Information to test the patience of one class of people (6)

DOWN

1. In an unmarried woman, her bearing shows her transgressions (13)

2. Enlarge on the tailless gnu if caught within a month (7) 3. Something that’s afoot may take a hammering (4)

5. A mule, with unknown quantity it’s hard to get a grip on (8) 6. The smallest amount to be rented out, as inside (5) 7. Cruel play, cast thus in an extremely showy way (13) 8. Minor route, if it’s about the phrase for ‘incidentally’ (5)

14. It is as high as one can get beside the sea (8)

17. Tiller of the land giving mushy vegetable to a worker (7) 18. A lot of birds like this sort of mattress (5)

20. Put tacking in and pour hot fat over it (5)

23. Loyal to Tory leader, regret following it (4)