Go "vroom vroom" (3)
I believe the answer is:
rev
'go vroom vroom' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rev that I've seen before include "Reverend (abbr.)" , "Gun (an engine)" , "Clergy title" , "Minister" , "Clergyman, or woman (abbr)" .)