The most common and most likely answer to this crossword clue is the 14 letter word FELLOW-FEELING
I've seen this crossword clue in Financial Times
F
E
L
L
O
W
-
F
E
E
L
I
N
G
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.
What does FELLOW-FEELING mean?
FELLOW-FEELING noun- A sense of sympathy for, consideration of, or shared interests with one or more other human beings.