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One gets cold and anxious, no end, when it's freezing (3,3)

Ross

I believe the answer is:

ice age

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This could be a double definition.

'one gets cold and anxious no end' is the first definition.
I know that 'cold' relates to this answer.

'when it's freezing' is the second definition.
(freezing-cold period of time)

Can you help me to learn more?

(Other definitions for ice age that I've seen before include "Freezing era" , "Cold historic period" , "Glacial epoch" , "time long ago" , "Cold period for Earth" .)

I've seen this clue in The Telegraph.
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