Energizes, with "up” (4)

I think it could be either:

amps

peps

'energizes with up' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the Universal and the King Feature Syndicate.

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