The most common and most likely answer to this crossword clue is the 9 plus 8 plus 5 letter word CHRISTMAS WRAPPING PAPER
I've seen this crossword clue in The Guardian
C
H
R
I
S
T
M
A
S
W
R
A
P
P
I
N
G
P
A
P
E
R
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.