Bananas or nuts in the outback? (4)

I believe the answer is:

wild

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'the outback?' is the definition.
(the outback is a wild region)

I don't understand the remainder of the clue.

(Other definitions for wild that I've seen before include "Not domesticated" , "Tempestuous" , "Impulsive" , "Feral - crazy" , "Savage" .)

I've seen this clue in The Sun.

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