Confess, admit (3,2)
I believe the answer is:
own up
This clue is a double definition.
'confess' is the first definition.
(I've seen this before)
'admit' is the second definition.
(I know this)
(Other definitions for own up that I've seen before include "Accept responsibility" , "be honest" , "Confess, admit guilt (3.2)" , "Come clean (about wrongdoing)" , "Confess, acknowledge fault" .)