Possibly more love for a lover (5)
I believe the answer is:
romeo
'a lover' is the definition.
(I've seen this before)
'possibly more love' is the wordplay.
'possibly' indicates anagramming the letters.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'more' with letters rearranged gives 'rome'.
'rome'+'o'='ROMEO'
'for' acts as a link.
(Other definitions for romeo that I've seen before include "Tragic Shakespeare hero" , "Star-crossed lover" , "Loving youth" , "Don Juan" , "Peripheral figure" .)