Stellar (6)
'stellar' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for astral that I've seen before include "Pertaining to the stars" , "Related to the stars" , "Like the stars" , "Altars (anag)" , "Starry sort of altars." .)
'stellar' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for starry that I've seen before include "Of celebrities" , "Like the night, perhaps" , "''..., ... Night'' (Don McLean's Vincent)" , "after dark, it's clear" , "'Of cloudless climes and - - skies' (Byron)" .)
(Other definitions for rad that I've seen before include "Unit of radiation" , "measure of dangerous activity" .)