Unit of electric charge (7)
I believe the answer is:
coulomb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unit of electric charge</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 coulomb that I've seen before include "SI unit of electric charge" , "Unit of electrical charge" , "physicist" .)