Japanese carp (3)
I believe the answer is:
koi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">japanese carp</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for koi that I've seen before include "Sort of carp" , "swimmer" , "Ornamental carp variety" , "sort of fish" , "Japanese fish" .)