Born in Cambridge alongside Backs (3)
I believe the answer is:
nee
'born' is the definition.
('nee' is 'born' in French)
'in cambridge alongside backs' is the wordplay.
'backs' suggests the final letters (I've seen 'back' mean this).
The last letters of 'in cambridge alongside' are 'NEE'.
(Other definitions for nee that I've seen before include "Used to indicate the maiden name of a married woman" , "Formerly named" , "Originally named (fem.)" , "Prefix indicating maiden name of married woman" , "Indicates the birth name of a married woman" .)