Chevalier song (4)
I believe the answer is:
mimi
'chevalier song' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mimi that I've seen before include "I'm, I'm mad about the heroine in 'La Boheme'" , "Her tiny hand was frozen (Puccini)" , "Tragic heroine" , "I'm upset twice by the operatic girl" , "'They call me - - ' , (Lucia)" .)