The most common and most likely answer to this crossword clue is the 7 letter word BATCHED
I've seen this crossword clue in The Guardian
B
A
T
C
H
E
D
Buddy explains!

The straight part
We know that "gathered together" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gathered together = batched.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 BATCHED mean?
BATCHED verb- To aggregate things together into a batch.
- To handle a set of input data or requests as a batch process.
- To live as a bachelor temporarily, of a married man or someone virtually married.