Young lover runs rings around me (5)
I believe the answer is:
romeo
'young lover' is the definition.
'runs rings around me' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'rings' becomes 'oo' (multiple circles).
'around' is an insertion indicator.
'oo' enclosing 'me' is 'omeo'.
'r'+'omeo'='ROMEO'
(Other definitions for romeo that I've seen before include "Casanova" , "his tragedy one was late?" , "Code word for the letter R" , "A loving character" , "Tragic Shakespeare hero" .)