The most common and most likely answer to this crossword clue is the 6 letter word SEXTET
I've seen this crossword clue in The Guardian
S
E
X
T
E
T
More clues leading to the result SEXTET
- Composition? Former partner let it stand outside
- Ten in group, film four fewer?
- … two more, ten in group and the others cut
- Group intercourse “offensive”
- Knowing offensive group of musicians
- Group send rude messages on film
- Explicit communication by film group
- Group – ten beginning to trudge into rising river
- Musicians send naughty messages to alien
- “It” — the heroin-dropping, techno top band
Buddy explains!

The straight part
We know that "group" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case group = sextet.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 SEXTET mean?
SEXTET noun- Any group of six people or things.
- A composition for six voices or instruments.
- A group of six singers or instrumentalists.