Possible Clues:

• Incentive concealed by conductor? Rachmaninoff's backing!
• 15 as an inducement
• Snowman’s nose, often
• Vegetable as incentive?
• Enticement to run motoring organisation is rejected
• Incentive that could cause an MOT failure?
• Kind of incentive?
• Incentive to turn up during motor racing
• Inducement of vehicle? Nonsense
• Figurative enticement