Related Clues:

• Shell kernel
• Difficult problem
• Lemonlike fruit
• Wrench target
• Brazil, e.g.
• Aficionado, informally
• Giant fan
• Bonbon center
• Bolt connector
• Cost of business, informally
• Hard fruit
• Filbert, for instance
• Bit of trail mix
• Bar-counter snack
• Fruitcake bit