Say sorry (9)
I believe the answer is:
apologise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">say sorry</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 apologise that I've seen before include "Ask forgiveness" , "Express regret (for action)" , "Say sorry, my mistake" , "Express regret for a wrong (S, not Z)" , "Say one is sorry" .)