The most common and most likely answer to this crossword clue is the 14 letter word FORE‑AND‑AFTER
F
O
R
E
â
€
‘
A
N
D
â
€
‘
A
F
T
E
R
Buddy explains!
The straight part
We know that "sailing vessel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sailing vessel = fore‑and‑after.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.