Business in orchestra decided (5)
I believe the answer is:
trade
'business' is the definition.
(trade is a kind of business)
'in orchestra decided' is the wordplay.
'in' says the answer is hidden in the clue.
'TRADE' is hidden within 'orchestra decided'.
(Other definitions for trade that I've seen before include "Deal - occupation" , "Dealings, business" , "Deal commercially" , "Commercial dealings" , "Commercial exchange of goods and services" .)