Overshoot the green badly, though not with the driver (9)
I believe the answer is:
passenger
'not with the driver' is the definition.
I can't tell whether this definition defines the answer.
'overshoot the green badly' is the wordplay.
'overshoot' becomes 'pass' (I can't justify this - if you can you should give a lot more credence to this answer).
'badly' indicates anagramming the letters (letters in the wrong order).
'green' anagrammed gives 'enger'.
'pass'+'enger'='PASSENGER'
'though' acts as a link.
Can you help me to learn more?
(Other definitions for passenger that I've seen before include "Useless member of team" , "One's driven" , "Dead wood" , "Person being carried in another's vehicle" , "One travelling" .)