Lead performer (4)
I believe the answer is:
star
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lead performer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(eg the star of a film)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for star that I've seen before include "Sirius, eg" , "A heavenly body or film favourite" , "Famous performer" , "Polaris, for example" , "Symbol of excellence" .)