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Swell working with one in the theatre (7)

Ross

I believe the answer is:

surgeon

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

'one in the theatre' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'swell working' is the wordplay.
'swell' becomes 'surge' (I've seen this before).
'working' becomes 'on' (on can mean working or activated).
'surge'+'on'='SURGEON'

'with' is the link.

Can you help me to learn more?

(Other definitions for surgeon that I've seen before include "Doctor with a scalpel" , "Performer of operations" , "Naval doctor" , "Medical operator" , "Operating medical practitioner" .)

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