The most common and most likely answer to this crossword clue is the 9 plus 4 letter word CROSSWORD CLUE
I've seen this crossword clue in The Daily Telegraph
C
R
O
S
S
W
O
R
D
C
L
U
E
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.