Business rated badly (5)
I believe the answer is:
trade
'business' is the definition.
(I know that trade is a type of business)
'rated badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'rated' anagrammed 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)" .)