Films depicting parts of vaccine manufacture (6)
I believe the answer is:
cinema
'films' is the definition.
(I've seen this in another clue)
'parts of vaccine manufacture' is the wordplay.
'parts' says the answer is hidden in the clue (I've seen 'part of' mean this).
'CINEMA' is hidden within 'of vaccine manufacture'.
'depicting' is the link.
(Other definitions for cinema that I've seen before include "Movie house" , "Film theatre" , "Picture-house 96)" , "Screening" , "Film industry" .)