The most common and most likely answer to this crossword clue is the 6 letter word DINGHY
I've seen this crossword clue in Financial Times
D
I
N
G
H
Y
More clues leading to the result DINGHY
- Not clear about horse boat
- Hard getting into dirty-looking small boat
- Rather dark around hospital boat
- . Dying to go out with husband in boat . . . .
- Hard to get into run-down boat
- Horse on board run-down boat
- Little boat scudding hypnotically about
- Hydrogen filling grey vessel that’s blown up?
- Husband’s into dark craft
- It might carry one over mere bit of misunderstanding hypothetically?
Buddy explains!

The straight part
We know that "boat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boat = dinghy.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 DINGHY mean?
DINGHY noun- A small open boat, propelled by oars or paddles, carried as a tender, lifeboat, or pleasure craft on a ship.
- An inflatable rubber life raft.
- To travel by dinghy.