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