Urban area to the West and North (4)
I believe the answer is:
town
'urban area' is the definition.
(I know that town is a type of urban area)
'to the west and north' is the wordplay.
'the west' becomes 'W' (abbreviation).
'and' says to put letters next to each other.
'north' becomes 'N' (abbreviation).
'to'+'w'+'n'='TOWN'
(Other definitions for town that I've seen before include "eg Ripley" , "Borough" , "SECOND PART OF 17" , "Carmathen?" , "See 9" .)