Middle of the road (6)
I believe the answer is:
median
'middle of the road' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for median that I've seen before include "Situated or passing through the middle" , "The middle of a series of values" , "Middle point or part" , "NI made it into the middle" , "Central reservation on a road" .)