Frank has to begin (4)
I believe the answer is:
open
I believe this is a double definition.
'frank' is the first definition.
(synonyms)
'to begin' is the second definition.
(both can mean to start)
'has' is the link.
(Other definitions for open that I've seen before include "Public" , "Frank and unconcealed" , "Freely accessible" , "Traditional room heater" , "Available for business, exposed" .)