Possible Clues:

• One element or another turned over, with supporting information
• Get iron transmuted to new element
• Common gas, N
• Charlie understood unfinished note that's dominant in the air
• Gas ring not designed to save energy
• Gas meter finally found between egg and melon
• Something in the air
• Having recalled iron in the end, I start to remember another metal element
• Air, mostly in G, tenor made a mess of
• Alkaloid constituent, by definition