Chomped down on (3)
I believe the answer is:
bit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chomped down on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bit that I've seen before include "A little coin" , "scrap" , "Unit of information" , "Small quantity or piece of metal for a horse" , "Small fragment" .)