Possibility, over time, for job in theatre (9)

I believe the answer is:

operation

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'job in theatre' is the definition.
'operation' can be an answer for 'job' (thesaurus). I'm not certain of the 'in theatre' bit.

'possibility over time' is the wordplay.
'possibility' becomes 'option' (I've seen this before).
'over' is an insertion indicator.
'time' becomes 'era' (era is a kind of time).
'option' enclosing 'era' is 'OPERATION'.

'for' is the link.

Can you help me to learn more?

(Other definitions for operation that I've seen before include "Theatre procedure" , "Action; process" , "Surgical or military procedure" , "medical treatment" , "activity" .)

I've seen this clue in The Guardian.

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