Use a whetstone (4)
I believe the answer is:
hone
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">use a whetstone</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 hone that I've seen before include "Strop" , "Smooth stone" , "Sharpen (a blade)" , "Polish" , "Sharpen tool on stone" .)