Possible Clues:

• How the firms might get set to pamper one
• Cut-price lettuce
• Let us sound for the companies
• Cut-price Greek island
• Scientific calculator button
• Let us sound green off grease, by the sound of it
• Let us sound so green
• Romaine variant
• Orgs. with 'Inc.' in their names
• Sounds as if this might let us be green