Shop-girl needs occasional back-up (4)

I believe the answer is:

deli

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'shop' is the definition.
(I know that deli is a type of shop)

I can't explain the remainder of the clue.

(Other definitions for deli that I've seen before include "Fine food shop" , "small food shop" , "Fine-food store" , "Food store" , "Unusual food shop" .)

I've seen this clue in the Sydney Morning Herald.

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