The most common and most likely answer to this crossword clue is the 4 plus 9 letter word GOOD AFTERNOON
I've seen this crossword clue in Independent
G
O
O
D
A
F
T
E
R
N
O
O
N
More clues leading to the result GOOD AFTERNOON
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.