He could start roaming in New Zealand (5)

I believe the answer is:

maori

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'he' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?

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

Can you help me to learn more?

(Other definitions for maori that I've seen before include "NZ aboriginal" , "Aboriginal New Zealander" , "NZ Polynesian language" , "I roam with New Zealander" , "Let it stand" .)

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