Leave the stage (4)
I believe the answer is:
exit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">leave the stage</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 exit that I've seen before include "Leave the building" , "Means of egress" , "farewell!" , "Act of going out" , "Actor's departure" .)