Twin sister of Apollo (7)
I believe the answer is:
artemis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">twin sister of apollo</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for artemis that I've seen before include "Head-hunter" , "Greek goddess of hunting" , "Diana" , "Apollo's twin sister" , "a famous hunter" .)