What could become a way to melt! (4)

I believe the answer is:

thaw

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'to melt' is the definition.
(synonyms)

'what could become a way' is the wordplay.
'what' can be anagrammed to 'THAW'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for thaw that I've seen before include "(Of snow) start to melt" , "snow does eventually" , "Melt in heat" , "when the temperature rises?" , "detente" .)

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

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