Mixed or am I a New Zealander (5)
I believe the answer is:
maori
'a new zealander' is the definition.
(the Maori are indigenous people of New Zealand)
'mixed or am i' is the wordplay.
'mixed' is an anagram indicator.
'or'+'am'='oram'
'oram' is an anagram of 'maor'.
'maor'+'i'='MAORI'
(Other definitions for maori that I've seen before include "Native New Zealander of Polynesian origin" , "Let it stand" , "One of New Zealand's aboriginal people" , "Aborigine of New Zealand" , "native person" .)