Related Clues:

• Diehard fan
• Wackjob
• __ butter
• Macadamia, e.g.
• Venture-launching cost, slangily
• Fancier and then some
• Huge fan
• Shell kernel
• Hit song from 'Flashdance'
• Extreme one
• Difficult problem
• Enthusiast, and then some
• Wrench target
• Slasher flick slasher
• Brazil, e.g.