The most common and most likely answer to this crossword clue is the 10 letter word BOATHOUSES
I've seen this crossword clue in The Daily Telegraph
B
O
A
T
H
O
U
S
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.
What does BOATHOUSES mean?
BOATHOUSES noun- A building at the edge of a river, lake or other body of water in which boats are kept.