Japanese mercenary (5)
I believe the answer is:
ninja
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">japanese mercenary</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 ninja that I've seen before include "Teenage Mutant ... Turtle (toy)" , "Animated turtle" , "One who steals" , "Killer" , "Japanese mercenary warrior" .)