Smells funny? Ours do! (6)
I believe the answer is:
odours
'smells' is the definition.
('odour' can be a synonym of 'smell')
'funny? ours do' is the wordplay.
'funny?' indicates an anagram (I've seen 'funny' mean this).
'ours'+'do'='oursdo'
'oursdo' anagrammed gives 'ODOURS'.
(Other definitions for odours that I've seen before include "Smells, usually unpleasant" , "Smells of any kind" , "Distinctive smells" , "for the nose to detect" , "bouquets" .)