The most common and most likely answer to this crossword clue is the 7 letter word MEETING
I've seen this crossword clue in The Guardian
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More clues leading to the result MEETING
Buddy explains!

The straight part
We know that "get-together" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get-together = meeting.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 MEETING mean?
MEETING noun- (gerund) The act of persons or things that meet.
- A gathering of persons for a purpose; an assembly.
- (collective) The people at such a gathering.
- An encounter between people, even accidental.
- A place or instance of junction or intersection; a confluence.
- A religious service held by a charismatic preacher in small towns in the United States.
- An administrative unit in the Religious Society of Friends (Quakers).
- To make contact (with) while in proximity.
- (Of groups) To come together.
- To make physical or perceptual contact.
- To satisfy; to comply with.
- To balance or come out correct.
- To perceive; to come to a knowledge of; to have personal acquaintance with; to experience; to suffer.
- To be mixed with, to be combined with aspects of.