Zodiac twins (6)
I believe the answer is:
gemini
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">zodiac twins</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 gemini that I've seen before include "Castor and Pollux constellation" , "Third sign of the Zodiac" , "Twins constellation" , "star group" , "Zodiacal twins" .)