The most common and most likely answer to this crossword clue is the 12 letter word POSTPRANDIAL
I've seen this crossword clue in The Guardian
P
O
S
T
P
R
A
N
D
I
A
L
More clues leading to the result POSTPRANDIAL
Buddy explains!
The straight part
We know that "after lunch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case after lunch = postprandial.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 POSTPRANDIAL mean?
POSTPRANDIAL adjective- After a meal, especially after dinner.