Sound part of a film (5)

I believe the answer is:

audio

'sound part of a film' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for audio that I've seen before include "type of reproduction" , "Prefix indicating sound or word" , "Prefix signifying sound or hearing" , "Electronic sound reproduction" , "Prefix indicating hearing or sound" .)

I've seen this clue in the Newsday.com and the Newsday.

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