The most common and most likely answer to this crossword clue is the 10 letter word CATAMARANS
I've seen this crossword clue in The Guardian
C
A
T
A
M
A
R
A
N
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 CATAMARANS mean?
CATAMARANS noun- A twin-hulled ship or boat.
- A quarrelsome woman; a scold.
- A raft of three pieces of wood lashed together, the middle piece being longer than the others, and serving as a keel on which the rower squats while paddling.
- An old kind of fireship.