The most common and most likely answer to this crossword clue is the 7 letter word CARAFES
C
A
R
A
F
E
S
More clues leading to the result CARAFES
Buddy explains!

The straight part
We know that "vessels" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vessels = carafes.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 CARAFES mean?
CARAFES noun- A bottle, usually glass and with a flared lip, used for serving water, wine, or other beverages.
- A glass pot with a spout for pouring, used for both serving coffee and as a receptacle during the brewing process.