Flow of electricity (7)
I believe the answer is:
current
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">flow</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(current is a kind of flow)</span><br/ ><br/ >'<span class="explanation-format__original">electricity</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(current electricity is a kind of electricity)</span><br/ ><br/ >'<span class="explanation-format__original">of</span>' acts as a link.<br/ ></span>
(Other definitions for current that I've seen before include "Up-to-date" , "In general use; flow" , "Source of power" , "Flow, of a river say" , "In vogue" .)