Bit part for a star (5)
I believe the answer is:
cameo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bit part for a star</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 cameo that I've seen before include "Piece of jewellery with carved portrait" , "Jewellery item with carved portrait" , "Small piece of hard stone carved with raised design" , "Star's tiny role" , "Something small but well done - say role in play" .)