Nut – one left, finally – chewed by zebra (lacking energy) (6)

I believe the answer is:

brazil

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'nut' is the definition.
(brazil is a kind of nut)

I don't understand the rest of the clue.

(Other definitions for brazil that I've seen before include "Country of Rio de Janeiro and Sao Paulo" , "Largest Latin-American country" , "Warm hooded jacket" , "South American state" , "Largest Latin American country" .)

I've seen this clue in The Mirror.

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