Related Clues:

• Vegan's taboo
• Ham or lamb
• 5-Down, e.g.
• Ham or hamburger
• Abattoir output
• Ham or hamburger, e.g.
• Substantive part
• It's in a nutshell
• Part of the Atkins diet
• Matter of course?
• Ravioli filling, perhaps
• Ham, e.g.
• Entree item, often
• Substantial content
• Source of protein