Set company? (4)
I believe the answer is:
firm
I believe this is a double definition.
'set' is the first definition.
(thesaurus)
'company?' is the second definition.
(firm can mean a company or business)
(Other definitions for firm that I've seen before include "Unflinching" , "House" , "Tight; company" , "Resolute kind of business" , "Solid; secure" .)