Call back about fire in the sky (8)
I believe the answer is:
empyrean
'in the sky' is the definition.
'call back about fire' is the wordplay.
'call' becomes 'name' ('name' can be a synonym of 'call'**).
'back' says the letters should be written backwards.
'about' means one lot of letters goes inside another.
'fire' becomes 'pyre' (I have seen 'Funereal fire' mean 'pyre' so perhaps 'fire' could also mean 'pyre').
'name' written backwards gives 'eman'.
'eman' enclosing 'pyre' is 'EMPYREAN'.
(Other definitions for empyrean that I've seen before include "Heavenly (archaic)" , "vault of the sky, celestial heaven" , "The heavens (poetic)" , "The celestial vault or firmament" , "Sublime; the highest heaven (arch.)" .)