Relating to ice; extremely cold (7)

I believe the answer is:

glacial

I believe this clue is a double definition.

'relating to ice' is the first definition.
(I've seen this before)

'extremely cold' is the second definition.
(I've seen this before)

(Other definitions for glacial that I've seen before include "Cold and icy" , "Of slow moving ice masses" , "Relating to ice" , "Pertaining to the ice ages" , "Frigid" .)

I've seen this clue in The Times.

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