Possible Clues:

• I am as they call me back twice
• Character played by Sue Hodge in Allo Allo
• 'They call me - - ' , (Lucia)
• Chevalier's theme song
• They call me at the double by the sound of it
• Identical notes sung by operatic heroine
• ''La Boheme'' character
• Twice she proclaims she is retiring
• Bohemian girl sounds egocentric
• They call me when I am back at the double