Diva's offering (4)
I believe the answer is:
aria
'diva's offering' 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 "Nessun Dorma, for example" , "Song, one from 'West Side Story' needing no introduction" , "Song from an opera (4)" , "selection of opera" , "Operatic solo, duet, etc" .)