Feel contrition (6)
I believe the answer is:
repent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">feel contrition</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 repent that I've seen before include "lying on the ground" , "creeping along the ground" , "Feel guilty" , "Feel regret/remorse" , "Be ashamed" .)