Luminary (4)
I believe the answer is:
star
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">luminary</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 star that I've seen before include "Outstanding entertainer" , "Astronomer - dreamer" , "It twinkles" , "Glamorous celebrity" , "Outstanding person" .)