Merchant who plays out the cards (6)

I believe the answer is:

dealer

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'merchant' is the definition.
(I know that dealer is a type of merchant)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dealer that I've seen before include "who makes first bid" , "One who trades, perhaps on stock exchange" , "Trader; issuer of hands" , "Trader; card player" , "See 24" .)

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

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