Propel (4)
I believe the answer is:
push
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">propel</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for push that I've seen before include "Tedious job" , "Urge" , "Promote (commodity)" , "Try to sell" , "Force one's way (through)" .)