Beethoven opera (7)
I believe the answer is:
fidelio
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">beethoven opera</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Fidelio is an opera by Ludwig van Beethoven)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fidelio that I've seen before include "Noted work" , "18 OPERA]" , "Beethoven opera; I.e. if old (anag.)" , "Beethoven's only opera" , "Noted performance" .)