The most common and most likely answer to this crossword clue is the 7 plus 4 plus 4 plus 4 letter word NOTHING WILL WORK FITB
N
O
T
H
I
N
G
W
I
L
L
W
O
R
K
F
I
T
B
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.