The most common and most likely answer to this crossword clue is the 9 letter word SINGSONGS
I've seen this crossword clue in The Times
S
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Buddy explains!

The straight part
We know that "vocal gatherings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vocal gatherings = singsongs.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 SINGSONGS mean?
SINGSONGS noun- A piece of verse with a simple, song-like rhythm.
- An informal gathering at which songs are sung; a singing session.
- Bad singing or poetry.
- A drawling or monotonous tone, as of a badly executed song.