Crossword Genius

Cold period (3,3)

Ross

I believe the answer is:

ice age

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cold period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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