Current units (7)
'current units' is the definition.
(amp is a kind of current unit)
This is the entire clue.
(Other definitions for amps that I've seen before include "concert gear" , "Current measures" , "Units of electrical power" , "Spam (anag)" , "Basic units of electric current" .)
'current units' is the definition.
(ampere is a kind of current unit)
This is all the clue.
(Another definition for amperes that I've seen is " Units of electrical current".)