Sounds and smells overwhelming one (6)
I believe the answer is:
noises
'sounds' is the definition.
(I know this)
'smells overwhelming one' is the wordplay.
'smells' becomes 'noses' (nosing is a kind of smelling).
'overwhelming' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'noses' going around 'i' is 'NOISES'.
'and' acts as a link.
(Other definitions for noises that I've seen before include "Disturbing sounds" , "Noses I turn up to sounds" , "Conventional phrases" , "- - Off (stage farce)" , "sounds unpleasant" .)