One should drive clean away from it (3,4)
I believe the answer is:
car wash
'away from it' is the definition.
I can't tell whether this definition defines the answer.
'one should drive clean' is the wordplay.
'one should drive' becomes 'car' (I can't explain this - if you can you should believe this answer much more).
'clean' becomes 'wash' (washing is a kind of cleaning).
'car'+'wash'='CAR-WASH'
Can you help me to learn more?
(Other definitions for car wash that I've seen before include "Vehicle cleaning service" , "Vehicle cleaning site" , "Mechanical vehicle cleaner" , "Vehicle dirt remover" , "Petrol station facility" .)