I am only a third of the way through this crossword but I think I might have an idea as to what the theme might be. But some help is desperately needed on a few clues:
5a: With cap back to front, Farington, say, is a boring thing (7)
24a: Handle (Edmund's) duck in Home Counties?(6)
37a: Old English striker to try gaining entry to series(7)
Thanks in advance!