It flies down a quiet country road (5)
I believe the answer is:
plane
'it flies down a' is the definition.
The definition suggests a singular noun which matches the answer.
'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'
Can you help me to learn more?
(Other definitions for plane that I've seen before include "barked?" , "Smoother" , "Form of transport" , "This flier" , "Tool for smoothing wood" .)