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Polar extremities, unfrozen - that's invaluable (9)

Ross

I believe the answer is:

priceless

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'that's invaluable' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for priceless that I've seen before include "Totally absurd" , "Beyond value" , "Invaluable - very funny" , "Of incalculable value" , "Very precious; absurd" .)

I've seen this clue in The Daily Express.
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