What oblivious theatregoer may do in part of London (7)
I believe the answer is:
clapham
'what oblivious theatregoer may do' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'part of london' is the wordplay.
I cannot really see how this works, but
'part' could be 'lap' (lap is a kind of part) and 'lap' is found in the answer.
The remaining letters 'cham' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Another definition for clapham that I've seen is " London area".)