The chap a girl comes round to (5)
I believe the answer is:
anton
'the chap' is the definition.
'a girl comes round to' is the wordplay.
'a girl' becomes 'ann' (woman's name).
'comes round' indicates putting letters inside.
'ann' placed around 'to' is 'ANTON'.
(Other definitions for anton that I've seen before include "-- Bruckner, composer" , "-- Chekhov, Russian dramatist" , "- Chekhov, playwright" , "Chekhov maybe" , "Rodgers perhaps" .)