Well-to-do urbanite keeps something to sniff (5)
I believe the answer is:
odour
'something to sniff' is the definition.
I can't tell whether this definition defines the answer.
'well-to-do urbanite keeps' is the wordplay.
'keeps' says the answer is hidden in the clue.
'ODOUR' is hidden in the letters of 'well to do urbanite'.
Can you help me to learn more?
(Other definitions for odour that I've seen before include "Aroma or fragrance" , "pervasive quality" , "Nasty smell" , "Distinctive smell" , "Perfume" .)