The most common and most likely answer to this crossword clue is the 9 letter word POWWOWING
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The straight part
We know that "Getting together" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case getting together = powwowing.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 POWWOWING mean?
POWWOWING verb- (of Native Americans) To hold a meeting; to gather together in council.
- (of Native Americans and by extension other groups, such as the Pennsylvania Dutch) To conduct a ritual in which magic is used.
- To hold a private conference.