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Lost form due to a rise in temperature (6)

Ross

I believe the answer is:

melted

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'lost' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for melted that I've seen before include "Became liquid with heat" , "Became liquefied" , "Thawed" , "Changed from a solid to a liquid state" , "Liquefied by heating" .)

I've seen this clue in The Globe and Mail.
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