Fixed; company (4)
I believe the answer is:
firm
I believe this is a double definition.
'fixed' is the first definition.
(I've seen this in another clue)
'company' is the second definition.
(firm can mean a company or business)
(Other definitions for firm that I've seen before include "commercial partnership" , "Hard" , "Resistant to pressure" , "Unyielding; company" , "Organization" .)