A martial art (3,4,2)
I believe the answer is:
tae kwon do
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a martial art</span>' is the definition.<br/ ><span class="explanation-format__explanation">(tae kwon do is a kind of martial art)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tae kwon do that I've seen before include "Koreans fighting" , "combat" , "sport" , "Martial activity" , "Modern Korean martial art" .)