Green area for driving (5)
I believe the answer is:
woods
'green' is the definition.
Although both the answer and definition are adjectives, I can't see how they can define each other.
'area for driving' is the wordplay.
'area' becomes 'wood' (I have seen 'Area of trees ' mean 'wood' so perhaps 'area' could also mean 'wood').
'for driving' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'wood'+'s'='WOODS'
Can you help me to learn more?
(Other definitions for woods that I've seen before include "Collections of trees, closely packed" , "very tall if red" , "Collection of closely packed trees" , "Tiger --, golfer" , "Groups of trees" .)