Faith in a business combination (5)
I believe the answer is:
trust
I believe this clue is a triple definition!
'faith' is the first definition.
(I know that faith can be written as trust)
'in' acts as a link.
'a business' is the second definition.
(thesaurus)
'combination' is the third definition.
(thesaurus)
(Other definitions for trust that I've seen before include "Pin one's faith on" , "bank on" , "Have faith in, regard as reliable" , "Firm belief (in someone/something)" , "Fidelity" .)