Perfected; sharpened (5)
I believe the answer is:
honed
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">perfected</span>' is the first definition.<br/ ><span class="explanation-format__explanation">('hone' can be a synonym of 'perfect')</span><br/ ><br/ >'<span class="explanation-format__original">sharpened</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(honing is a kind of sharpening)</span><br/ ><br/ ></span>
(Other definitions for honed that I've seen before include "Refined" , "Sharpened with a stone" , "Perfected" .)