Related Clues:

• Derricks do it
• Unit of current, informally
• Acoustic guitarist's lack
• Raise, with 'up'
• Item in a roadie's burden
• AC unit
• Music box
• Jack up
• Use a block and tackle, e.g.
• Gear for a roadie
• Rock requirement
• Measure of current
• It helps pump up the volume
• Cousin of the speaker?
• Rocker's need