Land measures (5)
I believe the answer is:
acres
'land measures' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acres that I've seen before include "Areas of 4840 square yards" , "One of them has 4840 square yards" , "large area of land" , "Imperial units or measures of land" , "fields?" .)