Black-and-white predator (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">black-and-white predator</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 orca that I've seen before include "swimmer in black and white" , "Massive killer" , "Marine creature" , "School killer" , "Large mammal" .)