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 "Noted work" , "Beethoven opera; I.e. if old (anag.)" , "18 OPERA]" , "Noted performance" , "Beethoven's only opera" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.