The most common and most likely answer to this crossword clue is the 6 plus 6 letter word POLICE RECORD
I've seen this crossword clue in The Guardian
P
O
L
I
C
E
R
E
C
O
R
D
Buddy explains!
The straight part
We know that "message in a bottle/)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case message in a bottle/) = police record.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.