New Zealanders are not flighty (5)

I believe the answer is:

kiwis

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'new zealanders' is the definition.
Although both the answer and definition are plural 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 kiwis that I've seen before include "NZ birds or team" , "Flightless birds and fruits" , "Flightless birds of New Zealand" .)

I've seen this clue in the Evening Standard.

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