The most common and most likely answer to this crossword clue is the 9 letter word FORESTAYS
I've seen this crossword clue in The Daily Telegraph
F
O
R
E
S
T
A
Y
S
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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 FORESTAYS mean?
FORESTAYS noun- A stay that extends from the top of the foremast to the bow or bowsprit of a sailing ship