The most common and most likely answer to this crossword clue is the 4 plus 8 letter word PLUM PUDDINGS
I've seen this crossword clue in The Daily Telegraph
P
L
U
M
P
U
D
D
I
N
G
S
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.