Teenage Mutant ___ Turtles (5)

I believe the answer is:

ninja

(Other definitions for ninja that I've seen before include "Stealthy warrior" , "Mercenary in feudal Japan" , "Japanese expert in stealth and martial arts" , "Teenage Mutant ... Turtle (toy)" , "Person skilled in Japanese martial art" .)

I've seen this clue in the Universal.

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