Merchant here allows fake (10)
I believe the answer is:
wholesaler
'merchant' is the definition.
(I know that wholesaler is a type of dealer)
'here allows fake' is the wordplay.
'fake' is an anagram indicator.
'here'+'allows'='hereallows'
'hereallows' is an anagram of 'WHOLESALER'.
(Other definitions for wholesaler that I've seen before include "Retailer's supplier" , "Bulk trader" , "firm that supplies in bulk" , "One supplying retailers in bulk" , "retailer of large quantities" .)