Related Clues:

• 5-Down, e.g.
• It may be tough to crack
• Ham or hamburger
• Abattoir output
• Snack item
• Ham or hamburger, e.g.
• Substantive part
• Word with hickory or health
• Enthusi-ast
• Bolt's adjunct
• Extreme fan
• Kernel of a sort
• Venture-launching cost
• It's in a nutshell
• Part of the Atkins diet