Crossword Genius

Investigator's interest (6)

Ross

I believe the answer is:

motive

(Other definitions for motive that I've seen before include "Purpose in doing something" , "Reason for doing something, say murder" , "Reason for committing a crime" , "Reason (for acting)" , "Rationale, purpose" .)

I've seen this clue in The New York Times.
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