Plan of the area? (4)
I believe the answer is:
plot
I believe this clue is a double definition.
'plan' is the first definition.
(I know that plan is the is a more specific form of the action of plot.)
'the area?' is the second definition.
(plot is a kind of area)
'of' acts as a link.
(Other definitions for plot that I've seen before include "Conspiracy, secret plan" , "Conspire - small piece of land" , "intrigue" , "Film story; graph" , "See 12 Across" .)