Provide new final bit to trading activity? (6)
I believe the answer is:
retail
'trading activity?' is the definition.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for retail that I've seen before include "Sell (in shop)" , "Sell in small quantities" , "The sale of goods to the public" , "Sale of goods individually" , "Form of sales" .)