Southernmost state (8)
I believe the answer is:
tasmania
'southernmost state' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tasmania that I've seen before include "Australian island state" , "somewhere in Antipodes?" , "Aussie's state" , "Van Diemen's Land" , "Island state off SE Australia, capital Hobart" .)