Smooth and quiet country road (5)
I believe the answer is:
plane
'smooth' is the definition.
(plane can mean to smooth down)
'quiet country road' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'country road' becomes 'lane' (I've seen this in another clue).
'p'+'lane'='PLANE'
'and' acts as a link.
(Other definitions for plane that I've seen before include "Woodworker's tool" , "Smoother" , "Smooth" , "What imitates bird" , "Nepal (anag.)" .)