Related Clues:

• You set your butt down here
• Airy
• It's often on at night
• Insubstantial
• Word with 69-Down
• End of a tunnel, proverbially
• Butt out here?
• See 10 Down
• Lamp
• PPCLI word
• Illuminate
• Hardly hefty
• Smoker's need
• *Airy
• * "Use an energy-saving bulb, rather than the old style..."