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Glacial period (3,3)

Ross

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6

3,3

ice age

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glacial period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for ice age that I've seen before include "Freezing era" , "'When glaciers covered the earth (3,3)'" , "Period of extreme cold" , "Cold period for Earth" , "Glacial period" .)

I've seen this clue in The Sun, The Times, The Daily Mail, The Independent and The Mirror.
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