Part of Australia (3,5,5)
I believe the answer is:
new south wales
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of australia</span>' is the definition.<br/ ><span class="explanation-format__explanation">('New South Wales' is part of 'australia')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for new south wales that I've seen before include "Australian state, capital Sydney" , "Name given to Australia when colonised in 1788; a state since 1901" , "Sydney's state" .)