The most common and most likely answer to this crossword clue is the 8 letter word CHALICES
I've seen this crossword clue in The Times
C
H
A
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Buddy explains!
The straight part
We know that "vessels there" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vessels there = chalices.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 CHALICES mean?
CHALICES noun- A large drinking cup, often having a stem and base and used especially for formal occasions and religious ceremonies.
- A kind of water-cooled pipe for smoking cannabis.