Cryptic crossword

ACROSS

1. A policeman going away with Eric perhaps (7)

5. Object of annoyance might be a grub wriggling about (7)

9. Make one a branch member but fail if tea is put out (9)

10. Not being together (and not altogether there?) (5)

11. To publish is to take one to court (5)

12. Discerning how one is getting on (6,3)

13. To bargain with one, get it a medley (9)

16. Having had a shot, got dismissed (5)

17. Brand the pen is mightier than? (5)

18. Favour one or the other to capture right and left (4,5)

20. Marigold got Alan, clued like this (9)

23. Plumped for work, and Edward followed (5)

25. Have nothing in sole that might be unattached (5)

26. If relying on ten-p, ended with this change (9)

27. Swell out as did nets put out for it (7)

28. In their birthday suits they have studs, in this version (7)

DOWN

1. Speech made about rain, too (7)

2. Band instruments, if put up, half fester (5)

3. Got together with Celt turning east in the cold (9)

4. Kingdom of Lear and capital of Mercia (5)

5. Such speed may leave one without capital support (9)

6. Corn starts germinating with a downpour (5)

7. In love with one armed like this if non-u (9)

8. Turned to trade, or could have (7)

14. Handsome appearance of thorough searches? (4,5)

15. Amazed to undo dates and find it (9)

16. Garlanded Don’s feet with nothing but a mixture (9)

17. Fed the infant Les with minced duck (7)

19. As steed is frisky, calms it with drugs (7)

21. Jeannie certainly held her sister’s daughter (5)

22. Tree for a writer around the South (5)

24. Things like Lime have their pedigrees (5)