Festive performance (4)
I believe the answer is:
gala
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">festive 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 gala that I've seen before include "Carnival, celebration" , "Special performance" , "A festive occasion, perhaps of sporting nature" , "Fête" , "Festive entertainment" .)