Related Clues:

• The upper air
• There (anag.)
• Clear upper air
• Solvent used by Rosie the Riveter
• Number three, possibly
• Anaesthetic required in gene therapy
• A theatrical number?
• About to spin having absorbed the anaesthetic?
• Theatrical number
• Three (anag.)
• Number three, perhaps
• Once widely-used anaesthetic
• Number three in wrong sequence
• Hydrocarbon
• Liquid hydrocarbon