Crossword Genius

Infiltrator (4)

Ross

I believe the answer is:

mole

'infiltrator' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for mole that I've seen before include "Spy - one that burrows" , "A spy within an organisation" , "Small congenital skin spot" , "Subterranean mammal" , "spy a > breakwater" .)

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