Practice performance (9)
I believe the answer is:
rehearsal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">practice performance</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 rehearsal that I've seen before include "show trial" , "Practice in theatre etc" , "Dry run" , "Play run-through" , "Preparation for a show" .)