Stealthy mercenary of feudal Japan (5)

I believe the answer is:

ninja

(Other definitions for ninja that I've seen before include "Ninjutsu expert" , "Practioner of ninjitsu" , "Teenage Mutant -- Turtles (TV/film)" , "Old Japanese hired assassin" , "martial art expert" .)

I've seen this clue in the Universal.

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