In this scenario, discontented Maori constituents set off for western Pacific region (10)
I believe the answer is:
micronesia
'pacific region' is the definition.
(I've seen this before)
'in this scenario discontented maori constituents set off for western' is the wordplay.
I cannot really see how this works, but
an anagram of 'scenario' is 'cronesia' which is present in the answer.
The remaining letters 'mi' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for micronesia that I've seen before include "somewhere in Pacific" , "part of Pacific" , "a far-off place" , "Pacific lands" , "Pacific region" .)