Film exec secures silence over papers (9)
I believe the answer is:
celluloid
'film' is the definition.
(I know that film can be written as celluloid)
'exec secures silence over papers' is the wordplay.
I cannot really understand how this works, but
'over' could be 'o' (cricket abbreviation) and 'o' is present in the answer.
'papers' could be 'id' (identification papers) and 'id' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for celluloid that I've seen before include "Film material" , "Old movie film" .)