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In New Zealand, they form only parts of the majority (5)

Ross

I believe the answer is:

maori

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'in' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I cannot understand how the remainder of the clue works.

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(Other definitions for maori that I've seen before include "I roam (anag)" , "Polynesian aboriginal" , "A native from the south" , "Member of aboriginal people of New Zealand" , "Original New Zealanders" .)

I've seen this clue in the Evening Standard.
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