Heavenly region around stellar twelve revolving (6)
I believe the answer is:
zodiac
'heavenly region' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for zodiac that I've seen before include "17 Across is a sign of the ......." , "Band of sky much used by astrologists" , "Astrologers' twelve signs" , "Astrological belt" , "Twelve-sign belt" .)