Firm action (6)
I believe the answer is:
agency
I believe this clue is a double definition.
'firm' is the first definition.
(thesaurus)
'action' is the second definition.
(thesaurus)
(Other definitions for agency that I've seen before include "Business that works on behalf of another" , "Business that acts for other businesses" , "Intervention producing a particular effect" , "Recruiters possibly" , "Business organisation" .)