Crossword Genius

Long period of history (3)

Ross

I believe the answer is:

era

'long period of history' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for era that I've seen before include "Special time" , "Stage" , "Long historic period" , "quite some time" , "Geological period" .)

I've seen this clue in The Times and The Mirror.
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