The most common and most likely answer to this crossword clue is the 1 plus 7 plus 3 plus 4 letter word A HUNDRED PER CENT
A
H
U
N
D
R
E
D
P
E
R
C
E
N
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.