Diva's chance to shine (4)
I believe the answer is:
aria
'diva's chance to shine' 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 "Song for solo voice from an oratorio, cantata etc" , "Song from an opera (4)" , "Puccini item" , "part of opera, maybe" , "Musical performance" .)