The most common and most likely answer to this crossword clue is the 5 plus 2 plus 1 plus 6 letter word BURNT TO A CINDER
I've seen this crossword clue in Financial Times
B
U
R
N
T
T
O
A
C
I
N
D
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.