Scheme for small piece of land (4)
I believe the answer is:
plot
This clue is a double definition.
'scheme' is the first definition.
(plot is a kind of scheme)
'small piece of land' is the second definition.
'for' is the link.
(Other definitions for plot that I've seen before include "See 12 Across" , "intrigue" , "Contrive" , "lost in poor judgment" , "... of story, family ..." .)