Olfactory property (5)
I believe the answer is:
scent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">olfactory property</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that olfactory property can be written as scent)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for scent that I've seen before include "Pleasant smell" , "Perfume for the tracker" , "Distinctive smell" , "Whiff" , "Trail" .)