Crossword Genius

Place where you find actors start (5)

Ross

I believe the answer is:

onset

'start' is the definition.
(both can mean the beginning of something)

'place where you find actors' is the wordplay.
I cannot really understand how this works, but
'place' could be 'set' (synonyms) and 'set' is found in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

(Other definitions for onset that I've seen before include "Beginning; military attack" , "Outbreak" , "Cast stone in attack" , "First signs" , "Attack using stone" .)

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