Love story about daughter, senior citizen (5)
I believe the answer is:
oldie
'senior citizen' is the definition.
(I've seen this before)
'love story about daughter' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'story' becomes 'lie' (I've seen this before).
'about' is an insertion indicator.
'daughter' becomes 'd'.
'lie' enclosing 'd' is 'ldie'.
'o'+'ldie'='OLDIE'
(Other definitions for oldie that I've seen before include "Standard song" , "Perennially popular song or film, often golden" , "An octogenarian, perhaps" , "One getting on" , "Still popular hit" .)