Crossword Genius

Eon (3)

Ross

I think it could be either:

era

age

'eon' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for era that I've seen before include "Major division of geological time" , "day" , "US equality law" , "Important historical period" , "Significant time" .)

I've seen this clue in The Telegraph and the Penny Press.
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