The most common and most likely answer to this crossword clue is the 6 letter word SLOOPS
I've seen this crossword clue in The Daily Telegraph
S
L
O
O
P
S
More clues leading to the result SLOOPS
Buddy explains!

The straight part
We know that "Ships" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ships = sloops.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 SLOOPS mean?
SLOOPS noun- A single-masted sailboat with only one headsail.
- A sailing warship, smaller than a frigate, with its guns all on one deck.
- A sloop-of-war, smaller than a frigate, larger than a corvette.