Crossword Genius

Cold period (3,3)

Ross

I believe the answer is:

ice age

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

This is all the clue.

(Other definitions for ice age that I've seen before include "Glacial era" , "Glacial epoch" , "lengthy number?" , "Pleistocene era" , "Very cold epoch" .)

I've seen this clue in The Times.
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