Lot of land (4)
I believe the answer is:
acre
'lot of land' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acre that I've seen before include "Old unit of area - old port" , "Care about this bit of land" , "marine location in Israel" , "Unit of land area" , "0.405 of a hectare" .)