"Habanera,” for one (4)
I believe the answer is:
aria
'habanera for one' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aria that I've seen before include "Operatic tune" , "Piece of music" , "Imitative art work" , "Nessun Dorma, for example" , "Puccini item" .)