Stench (5)
(Other definitions for smell that I've seen before include "Unpleasant odour" , "stink" , "Scent" , "Perceive through the nose" , "Sniff" .)
'stench' is the definition.
(I know that stench can be written as stink)
This is all the clue.
(Other definitions for stink that I've seen before include "Nasty smell" , "Unpleasant smell" , "trouble" , "song and dance" , "Reek" .)