Officer, one sometimes preceding general (9)

I believe the answer is:

inspector

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'officer' is the definition.
(inspector is a kind of officer)

I can't explain the rest of the clue.

(Other definitions for inspector that I've seen before include "Bus, train official" , "Ticket examiner" , "Lestrade for instance" , "Examining official" , "auditor" .)

I've seen this clue in The Times.

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