One sense
I believe the answer is:
smell
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one sense</span>' is the definition.<br/ ><span class="explanation-format__explanation">(smell is a kind of sense)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for smell that I've seen before include "Sniff" , "Nasal sense" , "Hum" , "stink" , "Unpleasant odour" .)