Allowed Edgar to shuffle out of the theatre (7)
I believe the answer is:
granted
'allowed' is the definition.
('grant' can be a synonym of 'allow')
'edgar to shuffle out of the theatre' is the wordplay.
'to shuffle' indicates anagramming the letters.
'out of' is an insertion indicator.
'the theatre' becomes 'nt' (National Theatre).
'edgar' with letters rearranged gives 'graed'.
'graed' placed around 'nt' is 'GRANTED'.
(Other definitions for granted that I've seen before include "Admittedly; given" , "One doesn't like being taken for it" , "Admittedly; gave formally" , "Conceded" , "Given; allowed" .)