Heavenly 'belt' (6)
I believe the answer is:
zodiac
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heavenly belt</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for zodiac that I've seen before include "It's divided into 12 constellations" , "Belt of twelve signs" , "Astrological band of the sky with 12 signs" , "Heavenly area" , "Heavenly region" .)