Merchant who distributes the cards? (6)
I believe the answer is:
'merchant' is the definition.
(I know that dealer is a type of distributer)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for dealer that I've seen before include "Merchant" , "Trader; card player" , "Trader as on Stock Exchange" , "The one who distributes the cards" , "One gives out the cards" .)