Jumbo tooth (4)
I believe the answer is:
tusk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jumbo tooth</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 tusk that I've seen before include "Long protruding tooth" , "Giant tooth" , "Source of ivory" , "Walrus's long tooth" , "Large tooth" .)