I've got a completed grid and surname (I recently gave a friend a calendar of his works as a present) but, before I go in search of the 22 cells, can I get a couple of parses (please don't let them be anagrams, I don't think I could take it! ๐ข)
25d - Leader of snare drums in bands (6)
My (original) answer is "bands" but, if the first letter is "leader of S(nare), then how does the rest come from "drums"? The middle 4 letters are actually a synonym of a type of "snare" but, if that's what meant, then how would the outside letters come from "drums"?
34d - Waterproof deck with onset of rain falling (4)
My (original) answer is a shortened version of 9 letter "waterproof" material, but the wordplay seems to suggest a word for "deck" has an R(ain) moved down/falling one place but if I move the R up one place in my original answer I, coincidentally, get the same word as in the middle 4 letters of the original 25d - which doesn't mean "deck"