Rub painfully (5)
I believe the answer is:
chafe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rub painfully</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chafe that I've seen before include "Fume" , "Rub annoyingly" , "are galling" , "Rub abrasively" , "Fret" .)