Stuck on the last two:
11A Dress up plot (4) L?I? - I have BABEL for 1D Hubbub (5), which may be wrong, so the first letter may not be L.
19A It's behind holy city (4) ?I?A? - The obvious answer is LIRA, but I have also found six cities which fit: BIDA, GIZA, LIMA, PISA, RIGA & VILA.
Any ideas?