Feel remorse over (3)
I believe the answer is:
rue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">feel remorse over</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rue that I've seen before include "Swann's way?" , "Feel bad" , "Regret in a French street" , "At one time, pity" , "Regret or repent" .)