It flies along a quiet country road (5)
I believe the answer is:
plane
'it flies along 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 before).
'p'+'lane'='PLANE'
Can you help me to learn more?
(Other definitions for plane that I've seen before include "Tool for smoothing wood" , "Nepal (anag.)" , "This flier" , "that soars into the sky" , "Aircraft - level surface - carpenter's tool" .)