Raw and not graded, the Maori's in (9)
I believe the answer is:
untreated
'raw' is the definition.
(similar in meaning)
'not graded the maori's in' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'graded the maori's in' becomes 'treated' (I can't explain this - if you can you should give a lot more credence to this answer).
'un'+'treated'='UNTREATED'
'and' is the link.
Can you help me to learn more?
(Other definitions for untreated that I've seen before include "no medical care given" , "without dressing" , "Not paid for by someone else" .)