The most common and most likely answer to this crossword clue is the 8 plus 2 plus 4 letter word FAREWELL TO ARMS
I've seen this crossword clue in Financial Times
F
A
R
E
W
E
L
L
T
O
A
R
M
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.