The most common and most likely answer to this crossword clue is the 9 plus 6 letter word CLOAKROOM TICKET
I've seen this crossword clue in The Guardian
C
L
O
A
K
R
O
O
M
T
I
C
K
E
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.