Firm (6)
'firm' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for stable that I've seen before include "Horse accommodation" , "Products all from same place" , "Firm and dependable" , "String may be kept in this" , "Firmly-fixed; building" .)
'firm' is the definition.
(I know that firm can be written as company)
This is the entire clue.
(Other definitions for company that I've seen before include "Actors" , "Commercial business" , "two, apparently?" , "Two, they say" , "See 10" .)