Business settled (4)
I believe the answer is:
firm
This clue is a double definition.
'business' is the first definition.
(firm is a kind of business)
'settled' is the second definition.
('firm' can be similar in meaning to 'settled')
(Other definitions for firm that I've seen before include "corporation?" , "team of doctors and assistants" , "Resolute kind of business" , "Tight; company" , "A steady business enterprise? (4)" .)