Related Clues:

• Geyser output
• Play, in a way
• Propellant for Casey Jones
• Part of AFB
• Boiling point?
• Water vapor
• See 28 Across
• Ring or rink figure, briefly
• It's good for a breather
• Robert Fulton power source
• Become furious
• Run on TV
• Smog sullies it
• Calliope power
• Calliope need