The most common and most likely answer to this crossword clue is the 3 plus 3 plus 9 plus 2 plus 5 letter word FOR THE AVOIDANCE OF DOUBT
I've seen this crossword clue in Independent
F
O
R
T
H
E
A
V
O
I
D
A
N
C
E
O
F
D
O
U
B
T
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.