Related Clues:

• Gas that's hard to ignore
• Kind of sign
• No. 10
• An inert gas
• It's in the air
• Colorful tropical fish
• See 61-Across
• Gas for a Broadway ad
• Inert gas
• Glowing sign
• Inert element used in lights
• Hardly pastel
• Type of lamp
• It may say 'DINER'
• Testy