Originally called back in the English lesson (3)
I believe the answer is:
nee
'originally called' is the definition.
(written before eg a maiden name)
'back in the english lesson' is the wordplay.
'back' is a reversal indicator.
'in' says the answer is hidden in the clue.
'een' is hidden in the letters of 'the english lesson'.
'een' written backwards gives 'NEE'.
(Other definitions for nee that I've seen before include "Prefix indicating maiden name of married woman" , "Adjective denoting woman's name before marriage" , "Born as (French)" , "Used to indicate a married woman's single name" , "Used to indicate the maiden name of a married woman" .)