Crossword Genius

Darn freezing! (9)

Ross

I believe the answer is:

perishing

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'freezing' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for perishing that I've seen before include "going west" , "Dying" .)

I've seen this clue in The Telegraph.
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