Related Clues:

• Serious fan
• Bolshevik, e.g.
• Political troublemaker
• Diehard
• Extreme fan
• Fanatical sort
• Stirrer
• Fanatical follower
• Fanatical one
• Extreme one
• Gung-ho type
• Fervent one
• Gung-ho sort
• Fan, and then some
• Enthusiast, plus