Regretted (4)
I believe the answer is:
rued
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">regretted</span>' is the definition.<br/ ><span class="explanation-format__explanation">('rue' can be a synonym of 'regret')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rued that I've seen before include "'Regretted, repented (4)'" , "was remorseful" , "Was contrite about" , "Bitterly regretted" , "Was sorry" .)