The most common and most likely answer to this crossword clue is the 4 plus 4 plus 2 plus 5 letter word COME DOWN TO EARTH
I've seen this crossword clue in The Daily Telegraph
C
O
M
E
D
O
W
N
T
O
E
A
R
T
H
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.