The most common and most likely answer to this crossword clue is the 1 plus 8 plus 4 plus 2 plus 6 letter word A MARRIAGE MADE IN HEAVEN
I've seen this crossword clue in The Guardian
A
M
A
R
R
I
A
G
E
M
A
D
E
I
N
H
E
A
V
E
N
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.