Related Clues:

• Horse's restraint
• A good one is cracked
• Funny line
• It may begin with "Knock knock"
• Trigger strap?
• Free ... is carte blanche
• Monologue bit
• Curb, with ''in''
• Charioteer's strap
• Bit of funny business
• Sappers in control of cavalry
• ... check to rule without force
• Check the weather on the radio
• Check drops for the ear
• Sappers in control of cavalry?