I really enjoyed this and didn't find it too difficult. That said, can I get a parse for...
38a A medley of leguminous trees (4)
I'm sure of my answer which means "a medley" but I don't get the tress part.
Also, do we just work out what the the four corner letters are from the other letter, ie if it is ?POTKICK then it would have to be S, or is there another way that I'm not seeing.