Crossword Genius

Sleeper agent (4)

Ross

I believe the answer is:

mole

'sleeper agent' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mole that I've seen before include "Skin spot; breakwater" , "Underground worker!" , "Burrowing mammal with velvety fur" , "spy a > breakwater" , ""Gentleman in black velvet''" .)

I've seen this clue in The Washington Post, the Universal, the USA Today, the New York Times and the L.A. Times Daily.
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