Business rated badly (5)
I believe the answer is:
trade
'business' is the definition.
(trade is a kind of business)
'rated badly' is the wordplay.
'badly' indicates an anagram.
'rated' with letters rearranged gives 'TRADE'.
(Other definitions for trade that I've seen before include "Barter, do business" , "Customers" , "Dealings, business" , "Buying/selling of goods" , "Give and receive (blows)" .)