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Cup tie rearranged: become frosty (3,2)

Ross

I believe the answer is:

ice up

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'become frosty' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for ice up that I've seen before include "Completely freeze" , "become frozen" , "get coat" .)

I've seen this clue in The Sun.
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