Crossword Genius

Ninja's forte (7)

Ross

I believe the answer is:

stealth

(Other definitions for stealth that I've seen before include "Halt set in furtive manner" , "Unseen machination" , "The last (anag.)" , "Cautious and surreptitious action or movement" , "Low-visibility military technology" .)

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