The most common and most likely answer to this crossword clue is the 11 letter word PREPRANDIAL
I've seen this crossword clue in The Daily Telegraph
P
R
E
P
R
A
N
D
I
A
L
Buddy explains!

The straight part
We know that "before meal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case before meal = preprandial.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 PREPRANDIAL mean?
PREPRANDIAL noun- A predinner drink; an apéritif.
- Of, relating to or occurring during the time before dinner.