Australia's largest lake (4)
I believe the answer is:
eyre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">australia's largest lake</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eyre that I've seen before include "lake, down under" , "Jane . . . ., . . . . Square" , "See 17 Across" , "Galway square" , "one loved by Rochester" .)