Known actors rejected one (7)
I believe the answer is:
outcast
'rejected one' is the definition.
(I've seen this in another clue)
'known actors' is the wordplay.
'known' becomes 'out' (as in news which is 'out').
'actors' becomes 'cast' (group of actors).
'out'+'cast'='OUTCAST'
(Other definitions for outcast that I've seen before include "untouchable" , "Pariah, leper" , "One banished from society" , "He has been evicted from society" , "In one of the islands, Joseph wrote" .)