Possible Clues:

• Such a person is likely to have too much on his plate at Christmas
• Avaricious newsman outwardly dismal
• Never satisfied
• Avaricious and acquisitive
• Such a person is likely to have too much on his plate
• Agree dyspepsia's part of being gluttonous
• Hardly generous
• Wanting to eat grass? Empty Guernsey would eat it
• Gobbling venison up, guy that's heartless and ...?
• Greek, wild-eyed when separated, and rapacious