He's got the girl to enter (5)
I believe the answer is:
anton
'he's' is the definition.
'the girl to enter' is the wordplay.
'the girl' becomes 'ann' (woman's name).
'enter' is an insertion indicator.
'ann' going around 'to' is 'ANTON'.
'got' acts as a link.
(Other definitions for anton that I've seen before include "..... Chekov" , "Rodgers perhaps" , "man" , "- Chekhov, playwright" , "-- Chekhov, Russian dramatist" .)