Shopkeeper sounds more disgusting (6)
I believe the answer is:
grocer
'shopkeeper' is the definition.
(I know that grocer is a type of shopkeeper)
'sounds more disgusting' is the wordplay.
'sounds' shows a homophone (sound like).
'more disgusting' becomes 'grosser'.
'grosser' sounds like 'GROCER'.
(Other definitions for grocer that I've seen before include "Provision merchant" , "Dealer in foodstuffs and household goods" , "Seller of household items and food" , "Seller of food and household supplies" , "Food dealer" .)