Nickname for Elizabeth I — 1953 Benjamin Britten opera written for Elizabeth II's coronation (8)

I believe the answer is:

gloriana

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

I've seen this clue in The Guardian.

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