Drive or urge forward (5)
I believe the answer is:
impel
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">drive</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that drive is a kind of impel)</span><br/ ><br/ >'<span class="explanation-format__original">urge forward</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for impel that I've seen before include "Urge or propel" , "Force forwards" , "Hold together" , "Oblige" , "Press on - drive forward" .)