The most common and most likely answer to this crossword clue is the 6 plus 5 letter word YA-BOO SUCKS
Y
A
-
B
O
O
S
U
C
K
S
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.