Related Clues:

• Fish out of river from which scales hang
• Kiss given to no one turning up -- I'm inert!
• Smile; timber
• Smile ... or shine
• Element above radon on the periodic table
• Strong piece of eg wood or metal used in construction
• Grin very widely
• Noble gas in TV tubes
• Noble gas used in some lasers
• Noble gas whose name comes from the Greek for "strange"
• It’s a gas
• Colourless odourless gas, Xe
• Summer smile
• Smile brightly
• Gas: current, presumably, rising