Drive back or away (5)
I believe the answer is:
repel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drive back or away</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 repel that I've seen before include "Deflect" , "Drive back or away" , "Be effective in controlling" , "Successfully resist" , "may turn your stomach" .)