Couldn't get rid of cold in Brazil (3)

I believe the answer is:

nut

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'brazil' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

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

Can you help me to learn more?

(Other definitions for nut that I've seen before include "Bolt securer" , "ood" , "Head; hard fruit" , "Cashew or hazel" , "Head (sl.)" .)

I've seen this clue in the Irish Times.

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