Factory worker has a feature in film (9)
I believe the answer is:
machinist
'factory worker' is the definition.
(I've seen this before)
'a feature in film' is the wordplay.
'feature' becomes 'chin' (facial feature).
'in' indicates putting letters inside.
'film' becomes 'mist' (to film over is to mist or fog over).
'a'+'chin'='achin'
'achin' going into 'mist' is 'MACHINIST'.
'has' acts as a link.
(Other definitions for machinist that I've seen before include "One working on a device" , "Engineer" , "Eg, lathe operator" , "Person operating device" , "factory worker, perhaps" .)