He could start roaming in New Zealand (5)

I believe the answer is:

maori

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'he' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(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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