A grinder? (5)
I believe the answer is:
molar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a grinder?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that grinder can be written as molar)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for molar that I've seen before include "Type of tooth" , "that could be capped" , "Large tooth" , "part of the daily grind" , "Moral (anag.)" .)