Posh emporium? (4)

I believe the answer is:

shop

I'm a little stuck... Click here to teach me more about this clue!

'emporium?' is the definition.
(I've seen this before)

'posh' is the wordplay.
'posh' can be anagrammed to 'SHOP'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for shop that I've seen before include "Store or boutique" , "Store - betray" , "Establishment for the sale of goods" , "Sell" , "Be disloyal to" .)

I've seen this clue in the Evening Standard.

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