Exhales audibly (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exhales audibly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sighs that I've seen before include "Lamentations" , "Yearns" , "gentle sounds" , "Moans" , "Bridge of - - (Venice)" .)