Ariel circles it (6)
I believe the answer is:
uranus
'ariel circles it' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for uranus that I've seen before include "heavenly body" , "Planet - Greek god of the sky" , "Planet that's the butt of much wordplay" , "Ringed planet" , "Planet of solar system" .)