Gnaw (4)
(Other definitions for bite that I've seen before include "(Of fish) take the bait" , "Small amount to eat" , "Use one's teeth" , "Get teeth into" , "Nip; nibble" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gnaw</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that chew is the is a more specific form of the action of gnaw.)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for chew that I've seen before include "Bite repeatedly" , "Treat for dog" , "bit of tobacco" , "Work between teeth, masticate" , "Try to eat" .)