Impetus (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impetus</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 momentum that I've seen before include "Corbyn supporters" , "Forward impetus" , "Impulse" , "Impetus gained by movement, maybe downhill" , "Corbynites" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impetus</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for drive that I've seen before include "Impel; house approach" , "Force into action, impel" , "Steer; trip" , "Sales campaign - energy - push" , "long golf shot" .)