Possible Clues:

• Juice
• Gun the engine — and get the vicar out of bed?
• Press accelerator
• Accelerate, as an engine
• Encourage minister in the lead
• Put one's foot down for a civilian's inclusion?
• Increase speed in an internal-combustion engine
• Prepare to burn evidence of life at vicarage?
• Gun, as a motor
• Put one's foot down? Minister's revolting