Little shop opening at the retail centre (5)

I believe the answer is:

small

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'little' is the definition.
('small' can be a synonym of 'little')

I can't explain the rest of the clue.

(Other definitions for small that I've seen before include "Insignificant; young" , "Social chat" , "of little significance" , "Piddling" , "Tiny" .)

I've seen this clue in the Evening Standard.

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