Eat like a rodent (4)
I believe the answer is:
gnaw
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eat like a rodent</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 gnaw that I've seen before include "Bite and wear away" , "Attack with teeth" , "Prey on one's mind" , "Bite persistently, grind" , "Eat at" .)