Very famous celebrity (8)
I believe the answer is:
megastar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very famous celebrity</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for megastar that I've seen before include "Dazzlingly successful person" , "Exceptionally famous man" , "Very famous person" , "Very famous artist" , "A-list celeb" .)