One rejected unfashionable actors (7)
I believe the answer is:
outcast
'one rejected' is the definition.
(thesaurus)
'unfashionable actors' is the wordplay.
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'actors' becomes 'cast' (I've seen this before).
'out'+'cast'='OUTCAST'
(Other definitions for outcast that I've seen before include "one's not admitted" , "A reject like 10 Across" , "Displaced person" , "Pariah, leper" , "Exile" .)