Cold in HGV? Extremely so! (6)

I believe the answer is:

arctic

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'cold' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

(Other definitions for arctic that I've seen before include "Of area round N. Pole" , "Poplar region" , "Relating to the cold North" , "Area around the North Pole" , "Imaginary line at approximately latitude 66 degrees 32' North" .)

I've seen this clue in The Times, The Telegraph and The Sun.

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