Reliable company (4)

I believe the answer is:

firm

I believe this clue is a double definition.

'reliable' is the first definition.
(thesaurus)

'company' is the second definition.
(thesaurus)

(Other definitions for firm that I've seen before include "Steadfast", "Company - stable", "Hard", "Unyielding; company", "Unflinching".)

I've seen this clue in Mirror.