Unusually generous fortune finally escaping theatre worker (7)

I believe the answer is:

surgeon

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'theatre worker' is the definition.
(someone working in a theatre)

I can't explain the remainder of the clue.

(Other definitions for surgeon that I've seen before include "Doctor with cutting tools" , "one performing in the theatre" , "Man with knife" , "Operating medical practitioner" , "incisive person" .)

I've seen this clue in The Telegraph.

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