Related Clues:

• Muscular
• Hardware item
• Hobbyist
• Filbert, e.g.
• It's tough to crack
• Acorn, essentially
• Aficionado
• Bookish one
• Bit of hardware
• Enthusiast plus,
• Squirrel's treat
• Techie, typically
• Trail mix bit
• Hazel, for one
• Take a shine to?