Crossword Genius

Source of unwanted bugs? (3)

Ross

I believe the answer is:

spy

(Other definitions for spy that I've seen before include "One who collects secret information as for government" , "One gathers information surreptitiously" , "Catch sight of" , "Mole, agent" , "Watch covertly like secret agent" .)

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