Market, trading centre (4)

I believe the answer is:

mart

I believe this clue is a double definition.

'market' is the first definition.
(I know that market can be written as mart)

'trading centre' is the second definition.
(I've seen this before)

(Other definitions for mart that I've seen before include "Take tram to market" , "US shop; market" , "Place" , "Trading centre" .)

I've seen this clue in the Evening Standard.

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