Smell or touch, eg (5)
I believe the answer is:
sense
I believe this clue is a double definition.
'smell' is the first definition.
(I know that smell can be written as sense)
'touch eg' is the second definition.
(touching is a kind of sensing)
(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" .)