Crossword Genius

Many moons __ (3)

Ross

I think it could be either:

eon

ago

'many moons' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eon that I've seen before include "Prolonged period" , "billion years" , "Immense period" , "plenty of time" , "Vast period" .)

I've seen this clue in the Universal, the LA Times and the USA Today.
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