I found this the toughest Speccie in a long time.
The thematic stuff wasn’t too bad, but lots of tricky and new (to me) words and parsing, especially in 23a, and 6, 19, 22 and 35 down.
I’m done now, but unsure of 1d, Divine piece of music (5). I have a divine piece of music that fits, but can’t see any cryptic part to the clue!