Merchant who gives you a hand! (6)
I believe the answer is:
dealer
'merchant' is the definition.
(dealer is a kind of merchant)
'gives you a hand' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
'hand' could be 'r' (abbreviation for right, as in the right-hand side) and 'r' is present in the answer.
The remaining letters 'dele' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'who' is the link.
Can you help me to learn more?
(Other definitions for dealer that I've seen before include "The one who distributes the cards" , "Card distributor" , "who makes first bid" , "See 24" , "putting his cards on the table?" .)