Juliet's lover (5)
I believe the answer is:
romeo
'juliet's lover' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for romeo that I've seen before include "Casanova" , "Loving youth" , "''O ..., ..., wherefore are thou ....'' (Shakespeare)" , "24's lover" , "Lover boy" .)