One selling charm, ten bucks (8)

I believe the answer is:

merchant

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'one selling' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'charm ten bucks' is the wordplay.
'charm ten' anagrams to 'MERCHANT'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for merchant that I've seen before include "Businessperson engaged in trade" , "Retail trader" , "Dealer" , "Shakespeare: ''The ... of Venice''" , "Broker" .)

I've seen this clue in The Times.

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