Originally called in one electrician (3)
I believe the answer is:
nee
'originally called' is the definition.
(written before eg a maiden name)
'in one electrician' is the wordplay.
'in' indicates the answer is hidden within the clue.
'NEE' is hidden in the letters of 'one electrician'.
(Other definitions for nee that I've seen before include "Formerly named" , "Name originally" , "Originally named (fem.)" , "Prefix denoting woman's name before marriage" , "Prefix denoting woman's unmarried name" .)