Related Clues:

• Engine oil measuring device
• Wally, the pickpocket's son, gets credit
• Declines credit for essential car accessory
• Baby carrot?
• Daughter with cosmetic obscuring face, one concealed under bonnet?
• Fool declines credit
• Idiot (informal)
• Idiot that tells you oil is running out?
• Idiot declines to give good mark
• Fool takes plunge short time later
• Fool declines good mark
• Rodney say, giving guacamole and hummus the thumbs-up?
• Swim poorly, swallowing tons — idiot!
• Idiot slopes away with Mo
• Fool lowers credit