The most common and most likely answer to this crossword clue is the 12 letter word DELICATESSEN
I've seen this crossword clue in Financial Times
D
E
L
I
C
A
T
E
S
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E
N
More clues leading to the result DELICATESSEN
- Shop with decent sales I redeveloped
- Derek briefly in charge at German city food shop
- Food shop transformed by caste in Leeds
- Idle scenes at new food shop
- Food shop in abandoned citadel to north of Ruhr city
- Shop entices — deals being outrageous
- The Italian, moving north, put in month at German city food shop
- Fudge as selected in food store
- One directed back to German city eating cat food
- Food store enticed sales all over the shop
Buddy explains!

The straight part
We know that "food store" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case food store = delicatessen.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 DELICATESSEN mean?
DELICATESSEN noun- Delicacies; exotic or expensive foods.
- A shop that sells cooked or prepared foods ready for serving.