Related Clues:

• Word on a light bulb
• Gig equip.
• Guitarist's aid
• Intensify, with up
• Intensify, with "up"
• Concert piece?
• George Harrison's instrument
• Rock band's accessory
• Picked-on item
• Crank (up)
• Rock band booster
• Sound investment for a band
• One for the roadie
• Increase, with "up"
• Mike gets juice here?