Thanks to Paul! Not sure he's ever composed a jigsaw puzzle, will have to check.
I found this extremely difficult. Technically, there's an easy way in due to a single 11-letter entry. But that's a beast of a clue (though enjoyable), so not much help.
First clue solved was Z, first in the grid was S. LOI definitely the 15-letter solution near the right edge (no more to avoid spoilers).
Some very fine clues: L and Y caused laughter on parsing.
Curious whether others found this as tough as I did.