Wears away (6)
I believe the answer is:
erodes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wears away</span>' is the definition.<br/ ><span class="explanation-format__explanation">('erode' can be a synonym of 'wear away')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for erodes that I've seen before include "Eats away" , "Wears away as by time or water" , "Wears away with weather" .)