The most common and most likely answer to this crossword clue is the 9 letter word SINFONIAS
I've seen this crossword clue in The Guardian
S
I
N
F
O
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A
S
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 SINFONIAS mean?
SINFONIAS noun- A symphony.
- A piece or music serving as an overture, interlude or ritornello.
- A small symphony orchestra.