Crossword Genius

Step on the gas, there's a good chap! (3)

Ross

I believe the answer is:

rev

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'step on the gas' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rev that I've seen before include "In engine-room speed up" , "Clergyman, or woman (abbr)" , "Minister" , "serviceman?" , "Clergy title" .)

I've seen this clue in the Evening Standard.
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