The most common and most likely answer to this crossword clue is the 6 plus 9 letter word VERBAL DIARRHOEA
I've seen this crossword clue in The Guardian
V
E
R
B
A
L
D
I
A
R
R
H
O
E
A
More clues leading to the result VERBAL DIARRHOEA
Buddy explains!
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.