Carnivore (6)
(Other definitions for walrus that I've seen before include "Marine mammal with two large tusks" , "'I am the ------', 1967 Lennon and McCartney song" , "'The time has come', the . . . said" , "Sea mammal, the morse" , "Marine beast (with moustache)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">carnivore</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for meat-eater that I've seen is " Carnivore".)
(Other definitions for meateater that I've seen before include "He favours flesh" , "Person wanting protein" .)