The most common and most likely answer to this crossword clue is the 9 letter word CLUBBABLE
I've seen this crossword clue in Financial Times
C
L
U
B
B
A
B
L
E
More clues leading to the result CLUBBABLE
Buddy explains!
The straight part
We know that "Gregarious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gregarious = clubbable.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 CLUBBABLE mean?
CLUBBABLE adjective- Sociable.