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' is an anagram indicator (letters in the wrong order).
'rated' is an anagram of '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)" .)