Crossword Genius

It's abstruse to die of cold in a storage unit (4,5)

Ross

I believe the answer is:

deepfreeze

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But I can't explain it at all! Could you help me understand?

(Other definitions for deepfreeze that I've seen before include "Cold food storage unit" , "Large iced food store" .)

I've seen this clue in the Sydney Morning Herald.
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