Leave rear of theatre this way, of course (5,2)
I believe the answer is:
quite so
'of course' is the definition.
(both can be used to express agreement)
'leave rear of theatre this way' is the wordplay.
I cannot really see how this works, but
'leave' could be 'quit' (synonyms) and 'quit' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
'way' could be 's' (Compass direction - South) and 's' is found within the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for quite so that I've seen is " Indeed".)