Graph; piece of ground (4)
I believe the answer is:
plot
This clue is a double definition.
'graph' is the first definition.
(I've seen this in another clue)
'piece of ground' is the second definition.
(plot is a kind of piece of ground)
(Other definitions for plot that I've seen before include "Small area of ground" , "Ground - plan" , "Patch of ground" , "Contrive" , "Mark position" .)