Smell from chamberpot no good (4)
I believe the answer is:
pong
'smell' is the definition.
(pong can informally mean a bad smell)
'chamberpot no good' is the wordplay.
'chamberpot' becomes 'po' (old-fashioned informal term for a chamber pot).
'no good' becomes 'ng' (abbreviation).
'po'+'ng'='PONG'
'from' is the link.
(Other definitions for pong that I've seen before include "Bad smell" , "Ping's regular partner?" , "Reek" , "It may make one wrinkle nose" , "Horrid smell (informal)" .)