Had regrets about (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">had regrets about</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rued that I've seen before include "Bitterly regretted" , "was remorseful" , "Was contrite about" , "Was sorry" , "'Regretted, repented (4)'" .)