The place to do business (4)
I believe the answer is:
deal
This clue is a double definition.
'the place' is the first definition.
(thesaurus)
'do business' is the second definition.
(as in doing a business deal)
'to' is the link.
(Other definitions for deal that I've seen before include "Soft wood or slang bargain" , "Wood - piece of business" , "Agreement; hand out cards" , "A port; a (good) amount" , "Put cards on table" .)