Land provided by heiress (4)
I believe the answer is:
eire
'land' is the definition.
(Eire is an example)
'provided by heiress' is the wordplay.
'provided by' says the answer is hidden in the clue (the answer is provided within the clue).
'EIRE' is hidden within 'heiress'.
(Other definitions for eire that I've seen before include "island" , "Southern Ireland" , "Official name of the Irish Republic, 1937-49" , "Land" , "Breakaway state" .)