One is inclined to drive quietly (4)
I believe the answer is:
ramp
'one is inclined' is the definition.
I can't tell whether this defines the answer.
'drive quietly' is the wordplay.
'drive' becomes 'ram' (RAM drive on a computer).
'quietly' becomes 'p' (p for piano and quiet).
'ram'+'p'='RAMP'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for ramp that I've seen before include "Sloping walkway" , "Slope for a pram" , "run around" , "Inclined path" , "Change of level - swindle" .)