In the end, one gets the girl (4)
I believe the answer is:
enid
'the girl' is the definition.
(girl's name)
'in the end one' is the wordplay.
'in' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'end' going around 'i' is 'ENID'.
'gets' is the link.
(Other definitions for enid that I've seen before include "Dine with this girl" , "Geraint's wife's" , "Arthurian wife" , "Lady" , "Dine out on this girl's name also" .)