Ludwig van Beethoven opera originally produced under the title Leonore (7)

I believe the answer is:

fidelio

(Other definitions for fidelio that I've seen before include "Beethoven opera; I.e. if old (anag.)" , "Beethoven's only opera" , "18 OPERA]" , "Noted performance" , "Noted work" .)

I've seen this clue in The Mirror.

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