There's a future in this emporium (5)

I believe the answer is:

store

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'emporium' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for store that I've seen before include "Large shop; keep" , "Put away for future use" , "Supply available for future use" , "Shop; repository" , "Computer memory; supply kept for when needed" .)

I've seen this clue in the Evening Standard.

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