Audible exhalations
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">audible exhalations</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sighs that I've seen before include "Yearns" , "Exhales sadly" , "Exhales audibly" , "Bridge of - - (Venice)" , "Lamentations" .)