Southern (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">southern</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for austral that I've seen before include "Southern - rat Saul (anag)" , "Of the southern hemisphere" , "coming from Perth?" .)