1953 Benjamin Britten opera commissioned for the Coronation of Elizabeth II (8)

I believe the answer is:

gloriana

(Other definitions for gloriana that I've seen before include "Britten opera; royal barge" , "Opera by Britten about Elizabeth I" , "Nickname of Queen Elizabeth 1 of England - sounds magnificent" , "A long air (anag) - name given to Elizabeth I" , "Name of the Faerie Queene (Spenser)" .)

I've seen this clue in The Mirror.

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