On-set film panel marking celebrity (6)
I believe the answer is:
plaque
This clue is a double definition.
'on-set film' is the first definition.
(film covering a set of teeth)
'panel marking celebrity' is the second definition.
(Other definitions for plaque that I've seen before include "Memorial plate" , "Unhygienic substance that forms on teeth" , "Film on tooth" , "filling could be the result" , "Build-up on teeth" .)