A mad race to get land (4)
I believe the answer is:
acre
'land' is the definition.
(I've seen this before)
'a mad race' is the wordplay.
'a mad' indicates an anagram.
'race' with letters rearranged gives 'ACRE'.
'to get' is the link.
(Other definitions for acre that I've seen before include "Imperial land measure" , "Care about this bit of land" , "Care about the piece of land" , "point four nought five of a hectare" , "Imperial land measurement" .)