Related Clues:

• Bill tack-on
• Contingency ___
• Bill add-on
• Extra amount
• Purchase price addition
• Charge levied
• What an assessor assesses
• Broker : commission :: waitress : ___
• Fixed cost
• Jockey
• Inside information
• Waiter's reward
• Word to the wise
• 'Monopoly payment'
• Pro's charge