The most common and most likely answer to this crossword clue is the 8 plus 1 plus 8 letter word OVERSEAS > OVERSEES
I've seen this crossword clue in The Guardian
O
V
E
R
S
E
A
S
>
O
V
E
R
S
E
E
S
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.