Related Clues:

• Kickback
• Illegal payoff
• Sweetener
• Under-the-table payment
• Bit of corruption
• Corrupt, in a way
• Payola, e.g.
• Palm grease
• Grease, so to speak
• Money offered to corrupt
• Tamper with horse to prevent it winning
• Disable by drugging, a horse say
• In the end this might have one in suspense
• A favourite way to fix the race
• Illegal payment in exchange for favour