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 an anagram.
'out of' indicates putting letters inside (some letters on the outside of others).
'the theatre' becomes 'NT' (National Theatre).
'edgar' anagrammed 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" .)