Moira's arrangement with a New Zealander (5)
I believe the answer is:
maori
'a new zealander' is the definition.
(the Maori are indigenous people of New Zealand)
'moira's arrangement' is the wordplay.
'arrangement' indicates an anagram.
'moira' anagrammed gives 'MAORI'.
'with' is the link.
(Other definitions for maori that I've seen before include "race" , "I roam (anag)" , "Member of New Zealand's aboriginal people" , "Let it stand" , "NZ Polynesian language" .)