The most common and most likely answer to this crossword clue is the 6 letter word BANDED
I've seen this crossword clue in The Guardian
B
A
N
D
E
D
More clues leading to the result BANDED
Buddy explains!
The straight part
We know that "Grouped together" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grouped together = banded.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 BANDED mean?
BANDED verb- To fasten with a band.
- To fasten an identifying band around the leg of (a bird).
- To group together for a common purpose; to confederate.
- To group (students) together by perceived ability; to stream.
- Marked with bands of colour
- Divided into bands