Originally called in one engineer (3)
I believe the answer is:
nee
'originally called' is the definition.
(written before eg a maiden name)
'in one engineer' is the wordplay.
'in' says the answer is hidden in the clue.
'NEE' is hidden within 'engineer'.
(Other definitions for nee that I've seen before include "Indicates the maiden name of a married woman" , "Adjective used to give woman's maiden name" , "Word used to indicate family name of a married woman" , "Born (to indicate maiden name)" , "It indicates a married woman's single name" .)