The most common and most likely answer to this crossword clue is the 5 plus 11 letter word DAVID COPPERFIELD
I've seen this crossword clue in The Times
D
A
V
I
D
C
O
P
P
E
R
F
I
E
L
D
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.