Crossword Genius

Member of police force becomes tense during bust (9)

Ross

I believe the answer is:

detective

'member of police' is the definition.
(type of police officer)

I don't understand how the rest of the clue works.

(Other definitions for detective that I've seen before include "Expert solver of clues" , "Criminal investigator" , "Public or private investigator" , "Private or police investigator" , "Policeman, say" .)

I've seen this clue in The Independent.
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