Cry over spilt milk? (4)
I believe the answer is:
oops
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cry over spilt milk?</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 oops that I've seen before include "Oh dear, that's a mistake!" , "Apologetic exclamation" , "Exclamation on making minor error" , "Something's been spilt!" , "Exclamation of making a blunder" .)