Lothario's line no more (5)
I believe the answer is:
lover
'lothario's' is the definition.
(I've seen this before)
'line no more' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'no more' becomes 'over' (over can mean finished or done).
'l'+'over'='LOVER'
(Other definitions for lover that I've seen before include "Opposite of hateful type" , "toy boy" , "'Lady Chatterley's - - ' by D H Lawrence" , "Devotee" , "Romantic partner" .)