With 65-Across, investigation site, and a punny description of the HEIST answers (5)

I believe the answer is:

crime

(Other definitions for crime that I've seen before include "Punishable deed" , "Speeding, perhaps" , "A serious offence" , "wrong-doing" , "they say it doesn't pay" .)

I've seen this clue in The Wall Street Journal.

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