Dumb show (4)
I believe the answer is:
mime
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dumb show</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that dumb show can be written as mime)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mime that I've seen before include "Act without speaking" , "Wagnerian role?" , "Acting without speaking" , "Pretend to sing" , "Express something with actions and gestures alone" .)