Admit guilt (3,2)
I believe the answer is:
own up
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">admit guilt</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for own up that I've seen before include "Come clean (about wrongdoing)" , "Accept responsibility" , "Admit to wrongdoing" , "be honest" , "Confess, acknowledge fault" .)