The most common and most likely answer to this crossword clue is the 12 letter word REFRESHMENTS
I've seen this crossword clue in The Guardian
R
E
F
R
E
S
H
M
E
N
T
S
More clues leading to the result REFRESHMENTS
Buddy explains!

The straight part
We know that "Snacks/Snacks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case snacks/snacks = refreshments.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 REFRESHMENTS mean?
REFRESHMENTS noun- The action of refreshing; a means of restoring strength, energy or vigour.
- A light snack or drink.