The most common and most likely answer to this crossword clue is the 7 letter word SEMINAR
I've seen this crossword clue in Financial Times
S
E
M
I
N
A
R
More clues leading to the result SEMINAR
- Group studying remains in ruin
- Class of Marines sorted out
- Class remains disorderly
- Discussion group in Iran I messed up, partially
- Study group remains disrupted
- Managed to turn up at end of house discussion group
- Engineer remains in workshop
- Academic gathering returning artist to French city
- Doctor remains for conference
- Study group in airmen’s mess
Buddy explains!

The straight part
We know that "Academic gathering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case academic gathering = seminar.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 SEMINAR mean?
SEMINAR noun- A class held for advanced studies in which students meet regularly to discuss original research, under the guidance of a professor.
- A meeting held for the exchange of useful information by members of a common business community.