Energy converter (5)
I believe the answer is:
motor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">energy converter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for motor that I've seen before include "Car - car's engine" , "Wheels" , "Move quickly" , "Engine of vehicle" , "Car; travel quickly" .)