Plot piece (4)
I believe the answer is:
acre
'plot piece' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acre that I've seen before include "Care about the piece of land" , "Unit of area of 4,840 square yards" , "Crusaders battlefield, now in Israel" , "Measure of land area" , "Square measure of land" .)