Backsliding (13)
I believe the answer is:
retrogression
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">backsliding</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for retrogression that I've seen before include "Returning to early state" , "Movement backwards" , "Process of returning to an inferior state" , "Process of returning to an earlier state" , "backsliding" .)