"O patria mia" opera (4)
I believe the answer is:
aida
'o patria mia opera' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aida that I've seen before include "Fragrant shrub" , "Egyptian opera by 11 Down" , "Operatic lady" , "Covent Garden production?" , "eponymous heroine" .)