Crossword Genius

Where cameras may film attack? (5)

Ross

I believe the answer is:

onset

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'where cameras may film' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'attack?' is the second definition.
('onset' can be a synonym of 'attack')

Can you help me to learn more?

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

I've seen this clue in The Telegraph.
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