Risk offloading diamonds to find diamonds? (3)

I believe the answer is:

ice

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'diamonds?' is the definition.
(slang term for diamonds)

I don't understand how the remainder of the clue works.

(Other definitions for ice that I've seen before include "Constituent of 2dn" , "Diamonds (slang)" , "Solid water" , "Rocks on which drink is served?" , "Freeze" .)

I've seen this clue in The Independent.

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