Have to confess (3)
I believe the answer is:
own
I believe this is a double definition.
'have' is the first definition.
(to have something is to own it)
'confess' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for own that I've seen before include "Be in legal possession of (3)" , "Allow" , "Private" , "Possess or confess" , "Keep" .)