A young lover is more befuddled by love (5)
I believe the answer is:
romeo
'a young lover' is the definition.
'more befuddled by love' is the wordplay.
'befuddled' indicates anagramming the letters.
'by' is a charade indicator (letters next to each other).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'more' is an anagram of 'rome'.
'rome'+'o'='ROMEO'
'is' is the link.
(Other definitions for romeo that I've seen before include "Dashing lover" , "24's lover" , "his tragedy one was late?" , "He's on the lookout for it?" , "Amorous male" .)