Working in theatre? Possibly an ego trip (9)

I believe the answer is:

operating

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'working in theatre?' is the definition.
'operating' can be an answer for 'working' (I've seen this before). I'm not certain of the 'in theatre?' bit.

'possibly an ego trip' is the wordplay.
'possibly' indicates anagramming the letters.
'an'+'ego'+'trip'='anegotrip'
'anegotrip' anagrammed gives 'OPERATING'.

Can you help me to learn more?

(Other definitions for operating that I've seen before include "Working" , "Performing surgery" , "Directing or controlling, machinery say" , "at work" , "Functioning" .)

I've seen this clue in The Times.

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