The most common and most likely answer to this crossword clue is the 5 plus 5 letter word BAINS MARIE
I've seen this crossword clue in The Guardian
B
A
I
N
S
M
A
R
I
E
Buddy explains!
The straight part
We know that "back in line/bedlam, born/vessels" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case back in line/bedlam, born/vessels = bains marie.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 BAINS MARIE mean?
BAINS MARIE noun- In cooking, a large pan containing hot water, into which other smaller pans are set in order to cook food slowly, or to keep food warm.