The most common and most likely answer to this crossword clue is the 13 letter word GASTRONOMICAL
I've seen this crossword clue in The Times
G
A
S
T
R
O
N
O
M
I
C
A
L
Buddy explains!

The straight part
We know that "Regarding meals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case regarding meals = gastronomical.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 GASTRONOMICAL mean?
GASTRONOMICAL adjective- Gastronomic