Lynda's new boy? (5)
I believe the answer is:
dylan
'boy?' is the definition.
'lynda's new' is the wordplay.
'new' is an anagram indicator.
'lynda' with letters rearranged gives 'DYLAN'.
(Other definitions for dylan that I've seen before include "Bob -, Blowin' in the Wind singer" , "Bob (musician) or Thomas (poet)" , "Bob (singer-songwriter) - Thomas (poet)" , "and 19: Welsh poet" , "Great Welsh poet . . . . . Thomas" .)