Access to a confession (9)
I believe the answer is:
admission
I believe this is a double definition.
'access' is the first definition.
(I know that access can be written as admission)
'confession' is the second definition.
(I've seen this before)
'to a' acts as a link.
(Other definitions for admission that I've seen before include "Disclosure" , "for which one may be charged" , "Entree" , "Acknowledge of the truth of something" , "Acknowledgment of the truth of something" .)