Chafes (4)
I believe the answer is:
rubs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chafes</span>' is the definition.<br/ ><span class="explanation-format__explanation">('rub' can be a synonym of 'chafe')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rubs that I've seen before include "Scours or polishes" , "Chafes" , "Massages" .)