Crossword Genius

Cloak-and-dagger sort (3)

Ross

I believe the answer is:

'cloak-and-dagger sort' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for spy that I've seen before include "Enemy agent" , "Glimpse" , "Discover" , "Catch sight of" , "Watch covertly like secret agent" .)

I've seen this clue in The New York Times and The Wall Street Journal.
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