Gitto,
7a: 'wives' accommodation' = harem = ODA
12a: 'of poor quality' = TIN
14a: 'An event'= THIS ( very sneaky, very imprecise, but given in Chambers).
43: answer is only two letters, straightforward double meaning.
44: answer is three letters, an East Anglian word for girl that crops up in the Listener from time to time. Begins with M.
3d: answer is four letters, simple anagram.
28d: answer is five letters meaning a destructive crime.
31: answer is four letters; 'one of the royals' is a derivative of the royal 'we'. I didn't like the definition, which is a slang expression for the face, whereas 'trap' is slang for mouth.
Hope this helps to sort out the 'description of the theme'.