The most common and most likely answer to this crossword clue is the 7 letter word COASTER
I've seen this crossword clue in Financial Times
C
O
A
S
T
E
R
More clues leading to the result COASTER
- Wheel around old vessel
- Escort a damaged vessel
- Wheel around old ship
- Might schooner be supported by this vessel?
- One stocked by barrow boy? It’s often under glass
- Vessel that may be covered by another, e.g. schooner
- Trading vessel or schooner may rest on it
- Mat‘s a freewheeler
- Wheel round old vessel
- Ship that could prevent schooner making its mark?
Buddy explains!

The straight part
We know that "vessel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vessel = coaster.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 COASTER mean?
COASTER noun- Agent noun of coast: one who coasts.
- Something that coasts, such as a sled or toboggan.
- A merchant vessel that stays in coastal waters.
- A sailor who travels only in coastal waters.
- A person who originates from or inhabits a coastal area.
- A small piece of material used to protect the surface of a table, upon which one places cups or mugs.
- A small tray on wheels, used to pass something around a table.
- A worthless compact disc or DVD, such as one that was burned incorrectly.
- A rollercoaster.
- (Lake Superior) A coaster trout (brook trout, Salvelinus fontinalis)
- A prostitute, especially a white woman, plying her trade in Chinese port towns.