Related Clues:

• What a slush fund may fund
• Inducement
• Kickback
• Illegal payoff
• Sweetener
• Under-the-table payment
• Bit of corruption
• Bribes grease
• Corrupt, in a way
• Payola, e.g.
• Palm grease
• Grease, so to speak
• Money offered to corrupt
• Good returns or corrupt payments
• In the end this might have one in suspense