Amps (up) (4)

There are a few possibilities for this:

Which length description are you looking for?:

revs

peps

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

This is the entire clue.

(Other definitions for revs that I've seen before include "Rotations of a motor, in short" , "Units of engine speed (abbr)" .)

I've seen this clue in the L.A. Times Daily, the Newsday, the New York Times and The Washington Post.

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