Related Clues:

• Restraining influence
• Restriction
• It may stop some horseplay
• Rider's strap
• Jock's strap
• Smarty Jones' control
• Curb, with 'in'
• Harness gear
• It's straight from the horse's mouth
• Jockey's strap
• Horse holder
• Hold your horses?
• Bit puller
• Trigger puller?
• Rider's grip