Crossword Genius

Sound boosters (4)

Ross

I believe the answer is:

amps

'sound boosters' 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 "Units of electrical power" , "concert gear" , "Spam (anag)" , "Current measures" , "'Units of electric current, in short (4)'" .)

I've seen this clue in the Penny Press and the Universal.
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