Shaped primarily like a star (6)
I believe the answer is:
astral
This clue could be a double definition.
'shaped primarily' is the first definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally define each other.
'like a star' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for astral that I've seen before include "Pertaining to the stars" , "Relating to stars" , "Altars (anag)" , "like a star" , "Resembling the stars - of the spirit world" .)