Crossword Genius

Potentially harmful mole (3)

Ross

I believe the answer is:

spy

(Other definitions for spy that I've seen before include "Mole, agent" , "One who collects secret information as for government" , "Person who secretly collects information as for government" , "Discover" , "Keep watch secretly, maybe for foreign government" .)

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