Exile unpopular group of actors (7)
I believe the answer is:
outcast
'exile' is the definition.
(outcast can mean an exile from somewhere)
'unpopular group of actors' is the wordplay.
'unpopular' becomes 'out' (similar in meaning).
'group of actors' becomes 'cast' (group of actors in a production).
'out'+'cast'='OUTCAST'
(Other definitions for outcast that I've seen before include "Rejected individual" , "Person rejected by a group or society" , "Discarded" , "One has been rejected by friends or society" , "One excluded from group" .)