Meet to entertain performer, all right? (12)
I believe the answer is:
satisfactory
'all right?' is the definition.
('satisfactory' can be similar in meaning to 'all right')
'meet to entertain performer' is the wordplay.
'meet' becomes 'satisfy' (satisfying is a kind of meeting**).
'to entertain' means one lot of letters goes inside another.
'performer' becomes 'actor' (actor is a kind of performer).
'satisfy' enclosing 'actor' is 'SATISFACTORY'.
(Other definitions for satisfactory that I've seen before include "Up to scratch" , "Meeting expectations" , "Acceptable - adequate" , "Good enough" , "Fulfilling expectations" .)