The most common and most likely answer to this crossword clue is the 9 letter word RIGOLETTO
I've seen this crossword clue in The Guardian
R
I
G
O
L
E
T
T
O
More clues leading to the result RIGOLETTO
- Gear Oscar hired out to a court jester
- Fit pair of spectacles worn by N European hunchback
- Musical work's intricate movement heard, with which film closed
- . Jester extremely irritating in part — too much backtracking
- Fit pair to be worn by Latvian hunchback
- Allowed into dress circle at opera
- Leave, in anger, dry old opera
- Reimagine Let It Go, or another famous musical work
- City welcomes attempt to hire theatre entrance for opera
- Fiddle, primarily one hired for opera
Buddy explains!

The straight part
We know that "opera" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case opera = rigoletto.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.