Drive forward (5)
I believe the answer is:
impel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drive forward</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for impel that I've seen before include "Motivate" , "Send or drive forward" , "Urge forward - push" , "Urge forward, drive" , "Oblige" .)