Crossword Genius

Step on the gas, my good man! (3)

Ross

I believe the answer is:

rev

I'm a little stuck... Click here to teach me more about this clue!

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

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

Can you help me to learn more?

(Other definitions for rev that I've seen before include "In engine-room speed up" , "One turn of an engine, in short" , "Clergyman, or woman (abbr)" , "Speed up engine (colloq.)" , "Motor rotation, in short" .)

I've seen this clue in the Evening Standard.
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