Cork's land (4)
I believe the answer is:
eire
'cork's land' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eire that I've seen before include "Irish name for Ireland" , "Northwest European country" , "Official name of the Irish Republic, 1937-49" , "Southern Ireland" , "Former name for the Republic of Ireland" .)