Circus MC (10)
I believe the answer is:
ringmaster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">circus mc</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 ringmaster that I've seen before include "Circus controller" , "who cracks the whip?" , "Top top man" , "circus performer" , "showman" .)