Immortal sometimes called Helios (6)

I believe the answer is:

apollo

(Other definitions for apollo that I've seen before include "Greek (and Roman) god of light, poetry etc" , "Greek god of the sun (6)" , "Greek god - US space programme dedicated to moon landings - butterfly" , "American space programme for landing men on moon" , "Greek god of light, son of Zeus" .)

I've seen this clue in The Mirror.

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