Possible Clues:

• Something bringing effervescence — a fixed amount to get inner energy
• Mixing with air/gas
• The process of adding carbon dioxide to liquid under pressure
• An allowance around the East to make things fizz
• Ventilator's job
• Carbon dioxide treatment
• Introduction of gas with a European helping
• Lawn improvement process
• An allowance of Russell is great gas!
• Making bubbly adult limit energy at first