Diva's opportunity to shine (4)
I believe the answer is:
aria
'diva's opportunity 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 "Musical performance" , "Summertime perhaps" , "Operatic solo performance" , "Imitative art work" , "Operatic song" .)