Related Clues:

• Part of TV to let off steam?
• Move quickly on or off
• Initially stuffy wife has urge to change
• Regulator of volume brought in to see what's in a pint?
• Toilet turned over, stripped to find ballcock
• Sorceress is after small wand
• It's either on or off?
• Small person that's charming, for change
• Joker in school getting cane
• Regulator stopping medieval vehicle
• Sign in Dell is useful when generating heat
• Gas regulator
• Water-flow control device
• Circuit-breaker
• Trumpet button