Khedivial Opera House premiere of 1871 (4)
I believe the answer is:
aida
'khedivial opera house premiere of 1871' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aida that I've seen before include "Covent Garden production?" , "eponymous heroine" , "Verdi's opera set in ancient Egypt" , "Verdi opera" , "she dies entombed" .)