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Glacial period (3,3)

Ross

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6

3,3

ice age

'glacial period' is the definition.
(synonyms)

This is the entire clue.

(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 Times, The Mirror, The Sun, The Independent and The Daily Mail.
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