God that helped humanity reach the moon (6)

I believe the answer is:

apollo

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'god' is the definition.
(Apollo is a Greek god)

I cannot understand how the remainder of the clue works.

(Other definitions for apollo that I've seen before include "US moon landing programme" , "American space programme for landing men on moon" , "Deity" , "mission of high-flying Americans?" , "Greek sun god and leader of the Muses" .)

I've seen this clue in The Irish Times.

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