Hi Tanglewood
I can't parse it either, but perhaps I have the wrong answer. My crossers are S?A?U?A
I haven't finished yet; five left in the bottom half. Any hints for 17ac and 21ac would be gratefully received.
17ac Wearing dress, emcee beginning to tremble as place emptied (5,4)
I have ?W??? T?W? I'm guessing it is ?W??G TOWN
21ac Rare earth element cut out with impure rocks (8)
I have ?U?O???E and have no idea