Related Clues:

• All in
• More than just interested
• Fan-club member, e.g.
• Bolt holder
• Seed
• Weirdo
• Waldorf salad ingredient
• Diabolic type
• Dyed-in-the-wool
• Granola bit
• Hardware item
• Idolizer
• Filbert, e.g.
• It's tough to crack
• Acorn, essentially