The most common and most likely answer to this crossword clue is the 10 letter word OPERA-GOER
I've seen this crossword clue in The Times
O
P
E
R
A
-
G
O
E
R
Buddy explains!

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.
What does OPERA-GOER mean?
OPERA-GOER noun- Someone who attends an opera performance