Units currently abbreviated (4)

I believe the answer is:

amps

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'units' is the definition.
(the amp is a unit of electrical current)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for amps that I've seen before include "Units of electrical power" , "'Units of electric current, in short (4)'" , "Current measures" , "Basic units of electric current" , "concert gear" .)

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