Possible Clues:

• Clerical address, for short
• Make go 'vroom'
• Crank up
• Cleric's address (Abbr.)
• Clergyman, or woman (abbr)
• Show off one's Harley, in a way
• Prep for dragging
• Increase motor speed, briefly
• Cause to go "Vroom!"
• Increase, with ''up''