Firm without any deceit to speak of generates yield (6)
I believe the answer is:
comply
'yield' is the definition.
(thesaurus)
'firm without any deceit to speak of' is the wordplay.
I cannot really see how this works, but
'firm' could be 'co' (a firm is a company) and 'co' is found in the answer.
This explanation may well be incorrect...
'generates' is the link.
Can you help me to learn more?
(Other definitions for comply that I've seen before include "Yield to the wishes of another" , "Agree - obey orders" , "Yield to another's wishes or rules" , "Meet specified standards" , "Go along with" .)