The most common and most likely answer to this crossword clue is the 4 plus 4 letter word PRIX FIXE
I've seen this crossword clue in Financial Times
P
R
I
X
F
I
X
E
Buddy explains!
The straight part
We know that "cost of the meal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cost of the meal = prix fixe.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.