The most common and most likely answer to this crossword clue is the 8 letter word CELLARED
I've seen this crossword clue in The Guardian
C
E
L
L
A
R
E
D
More clues leading to the result CELLARED
Buddy explains!

The straight part
We know that "in wine store" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in wine store = cellared.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 CELLARED mean?
CELLARED verb- To store in a cellar.
- Provided with a cellar.