Crossword Genius

Highest part of the heavens, thought by the ancients to contain the pure element of fire (8)

Ross

I believe the answer is:

empyrean

(Other definitions for empyrean that I've seen before include "Rap enemy under celestial vault" , "The heavens (poetic)" , "vault of the sky, celestial heaven" , "Heavenly (archaic)" , "May preen about the celestial vault" .)

I've seen this clue in The Independent.
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