Electrical power unit (8)
I believe the answer is:
kilowatt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">electrical power unit</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 kilowatt that I've seen before include "Power used by one bar of the average electric fire" , "Unit of electrical power" , "Unit of electric power" , "measure of power" , "kW" .)