The annoying one is 13d. I have what looks to be the right but unaltered answer - it has a religious connection. But I can't see the alternative which I'm assuming is a market garden. Any hints?
After the first few entries, I guessed the word and worked backwards to the parsing with almost every clue.
I'm still not sure of the original for 21a.
just my point, mattrom. No point in taxing oneself over the wordplay if you're sure of the definition. 21 I think is nerve in a word for pull backwards minus the v.