Crossword Genius

Beginning place for actors at work? (5)

Ross

I believe the answer is:

onset

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

'beginning' is the definition.
(I know that beginning can be written as onset)

'at work?' is the wordplay.
'at' becomes 'on' (location).
'work?' becomes 'set' (set is a kind of work).
'on'+'set'='ONSET'

'place for actors' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for onset that I've seen before include "Advent" , "Start - opening moments" , "Beginning (of disease etc)" , "Inception" , "origin" .)

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