Interesting. I have a full grid but I’m not sure I can match everything back to the preamble. Understand the heading and the one exception to the primary source.
40a and 18d were interesting discoveries.
1a struck me as somewhat “ghost-ish”, i.e. think of a synonym then take alternative letters before adding a fish. I suppose the defence is “what else could it be?” But I’m not entirely sure this is fair.