The most common and most likely answer to this crossword clue is the 8 plus 4 letter word WRECKING BALL
I've seen this crossword clue in The Guardian
W
R
E
C
K
I
N
G
B
A
L
L
More clues leading to the result WRECKING BALL
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.