Originally called (3)
I believe the answer is:
nee
'originally called' is the definition.
(written before eg a maiden name)
This is the entire clue.
(Other definitions for nee that I've seen before include "Prefix to married woman's maiden name" , "Prefix indicating maiden name before marriage" , "Word used to indicate family name of a married woman" , "Originally named (fem.)" , "Name originally" .)