Song about stinker seen in rural idyll (7)
I believe the answer is:
arcadia
'rural idyll' is the definition.
(I've seen this before)
'song about stinker' is the wordplay.
'song' becomes 'aria' (aria is a kind of song).
'about' indicates putting letters inside.
'stinker' becomes 'cad' (both can mean a dishonourable man).
'aria' placed around 'cad' is 'ARCADIA'.
'seen in' acts as a link.
(Other definitions for arcadia that I've seen before include "Ideal rustic paradise" , "In Greece, its capital is Tripoli" , "Poetically the home of songloving shepherds" , "pastoral paradise" , "Tom Stoppard play" .)