The most common and most likely answer to this crossword clue is the 4 plus 4 letter word PART SONG
I've seen this crossword clue in Independent
P
A
R
T
S
O
N
G
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 PART SONG mean?
PART SONG noun- A form of unaccompanied, often homophonic, vocal composition usually for a few voices or a small choir