The most common and most likely answer to this crossword clue is the 9 letter word OFF-STAGE
I've seen this crossword clue in Financial Times
O
F
F
-
S
T
A
G
E
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 OFF-STAGE mean?
OFF-STAGE adjective- Of, or relating to that part of a stage not visible to the audience.
- Of, or relating to the private life of a celebrity.
- Taking place offstage (as above)