Poetic sphere (3)
I believe the answer is:
orb
'poetic sphere' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for orb that I've seen before include "ball with cross" , "Jewelled ornament" , "Poetically eye" , "Celestial body; sphere" , "Sphere (found in regalia)" .)