Exclamation of rebuke (3-3)
I believe the answer is:
tut-tut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exclamation of rebuke</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tut-tut that I've seen before include "Words of disapproval" , "Sounds of disapproval" , "Naughty, naughty!" , "Expression of disapproval - a repetitive palindrome" , "That's bad" .)