Crossword Genius

Cloak-and-dagger sort (3)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cloak-and-dagger sort</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Wall Street Journal and The New York Times.
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