Born in the Pyrenees (3)
I believe the answer is:
nee
'born' is the definition.
('nee' is 'born' in French)
'in the pyrenees' is the wordplay.
'in' indicates the answer is hidden within the clue.
'NEE' is hidden in the letters of 'pyrenees'.
(Other definitions for nee that I've seen before include "Used to show a married woman's single name" , "Used to indicate the maiden name of a married woman" , "Indicates the birth name of a married woman" , "indicate old name" , "Indicates the family name of a married woman" .)