Chevy hybrid (4)
I believe the answer is:
volt
'chevy hybrid' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for volt that I've seen before include "Electrical unit of measurement" , "Unit of electric potential difference" , "Unit of electrical potential" , "SI unit of electromotive force" , "Electrical SI unit named after a pioneering Italian physicist, d. 1827" .)