Smell or touch, eg (5)
I believe the answer is:
sense
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">smell</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that smell can be written as sense)</span><br/ ><br/ >'<span class="explanation-format__original">touch eg</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(touching is a kind of sensing)</span><br/ ><br/ ></span>
(Other definitions for sense that I've seen before include "smell, for example" , "Be vaguely aware of" , "eg Vision, hearing" , "Practicality, often common (5)" , "Hearing maybe" .)