Indicates the birth name of a married woman (3)
I believe the answer is:
nee
'indicates the birth name of a married woman' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for nee that I've seen before include "Originally called" , "Adjective used to give woman's maiden name" , "Surnamed at birth" , "Prefix to married woman's maiden name" , "Born (indicating a woman's maiden name)" .)