Related Clues:

• Part of the Atkins diet
• Matter of course?
• Ravioli filling, perhaps
• Ham, e.g.
• Entree item, often
• Substantial content
• Source of protein
• Butcher-shop buy
• 7-Down product
• Beef or bacon
• Steak or veal
• Deli array
• Word with head or ball
• Lamb, for one
• Carnivore's intake