The most common and most likely answer to this crossword clue is the 2 plus 7 plus 6 letter word GO WITHOUT SAYING
G
O
W
I
T
H
O
U
T
S
A
Y
I
N
G
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.