Girl accepts ring later (4)
I believe the answer is:
anon
'later' is the definition.
('anon' can be a synonym of 'later')
'girl accepts ring' is the wordplay.
'girl' becomes 'ann' (**).
'accepts' means one lot of letters goes inside another.
'ring' becomes 'o'.
'ann' going around 'o' is 'ANON'.
(Other definitions for anon that I've seen before include "Soon, shortly (archaic)" , "In due course" , "Soon; unnamed" , "Without known author" , "Writer unknown" .)