Bonus performance (6)
I believe the answer is:
encore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bonus performance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for encore that I've seen before include "Enthusiastic call" , "Call to perform again" , "Bis!" , "Additional work performed" , "extra performance" .)