Theater rebuke (3)
I believe the answer is:
shh
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">theater rebuke</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 shh that I've seen before include "Be quiet!" , "Be silent" .)