Player seen in factory (5)
I believe the answer is:
actor
'player' is the definition.
(synonyms)
'in factory' is the wordplay.
'in' says the answer is hidden in the clue.
'ACTOR' is hidden in the letters of 'factory'.
'seen' is the link.
(Other definitions for actor that I've seen before include "Gielgud, say" , "Player - performer" , "Person performing on stage or screen" , "One with role" , "one to take on roles" .)