I loved this. Some absolutely brilliant clueing in the connection between surface and definition/wordplay without being &lit (7dn, 18dn), some that were simply ridiculous, in a good way (39ac, 32ac), some pleasing recursiveness (12ac)—just lots of fun in these clues, while being impressively economical. I've not been solving The Listener for long but these have been among my favourite clues yet.
Like many here seem to, I really struggled with the endgame, but once I understood the second level of it, it came together very quickly and I was relieved to feel the confidence that is granted by the unambiguous nature of the result. I was certain this was going to be a puzzle in which I was doubting my grid illustrations at the, but no.
(I will say 20ac was a nightmare for me and I had to revise it twice over.)