The most common and most likely answer to this crossword clue is the 5 plus 2 plus 3 plus 4 letter word JOKER IN THE PACK
I've seen this crossword clue in Independent
J
O
K
E
R
I
N
T
H
E
P
A
C
K
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.