Principal actress (7,4)
I believe the answer is:
leading lady
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">principal actress</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 leading lady that I've seen before include "Heroine - gaily landed (anag)" , "a star" , "Queen Elizabeth II?" , "Female playing main part in play" , "Actress with principal part" .)