Crossword Genius

Beginning of sound at the film studio (5)

Ross

I believe the answer is:

onset

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'beginning of sound' is the definition.
'onset' can be an answer for 'beginning' (onset is a kind of beginning). I'm not certain of the 'of sound' bit.

'the film studio' is the wordplay.
'the film' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'studio' becomes 'set' (as in a TV set).
'on'+'set'='ONSET'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for onset that I've seen before include "Beginning (of something often unpleasant)" , "Start - notes (anag)" , "Stone (anag)" , "Start, beginning" , "Advent" .)

I've seen this clue in the Sydney Morning Herald.
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