Estate measures (5)
I believe the answer is:
acres
'estate 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 "One of them has 4840 square yards" , "Land area measures" , "Extensive landed property (often rolling)" , "Scare (anag)" , "Cares about the land measures" .)