Motors (7)
I believe the answer is:
engines
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">motors</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for engines that I've seen before include "Locomotives" , "Motors" , "Machines that convert power into motion" , "Powerful machines" .)