One little thing that’s driving me mad (apart from the much-discussed ambiguities in the end game):
33d - Head of New York family possibly sang (3)
I’m parsing this as double definition, with the first 6 words quite obviously giving the answer. That leaves the final word to be also a definition. But I can’t really make it fit unless I change the second letter. But from the end game instructions, this can’t be a misprint clue, as 36d completes the misprint instructions nicely.