Stable business (4)
I believe the answer is:
firm
This clue is a double definition.
'stable' is the first definition.
('firm' can be similar in meaning to 'stable')
'business' is the second definition.
(firm is a kind of business)
(Other definitions for firm that I've seen before include "Secure - business partnership" , "Steady and resolute" , "corporation?" , "A steady business enterprise? (4)" , "Unflinching" .)