Actor’s fear (5,6)
I believe the answer is:
stage fright
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">actor's fear</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 stage fright that I've seen before include "problem for players" , "Nerves in front of an audience" , "Nervousness in front of audience" , "Performer's fear" , "attack of nerves" .)