Drive off, repulse (5)
I believe the answer is:
repel
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">drive off</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">repulse</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that repulse can be written as repel)</span><br/ ><br/ ></span>
(Other definitions for repel that I've seen before include "Be effective in controlling" , "Drive back or ward off" , "Drive back - revolt" , "Spurn" , "give you the creeps" .)