County has finished with girl (7)
I believe the answer is:
donegal
'county' is the definition.
(county of Ireland)
'finished with girl' is the wordplay.
'finished' becomes 'done' (both can mean completed).
'with' means one lot of letters go next to another.
'girl' becomes 'gal'.
'done'+'gal'='DONEGAL'
'has' is the link.
(Other definitions for donegal that I've seen before include "Irish town" , "part of Ireland" , "County of NW Ireland" , "County of NW?Ireland" , "Lean dog (anag) - Irish county" .)