The most common and most likely answer to this crossword clue is the 9 letter word PICNICKED
I've seen this crossword clue in Financial Times
P
I
C
N
I
C
K
E
D
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 PICNICKED mean?
PICNICKED verb- To take part in a picnic.