Finished with girl in Irish county (7)
I believe the answer is:
donegal
'irish county' is the definition.
(I've seen this in another clue)
'finished with girl' is the wordplay.
'finished' becomes 'done' (similar in meaning).
'with' means one lot of letters go next to another.
'girl' becomes 'gal' (synonyms).
'done'+'gal'='DONEGAL'
'in' is the link.
(Other definitions for donegal that I've seen before include "Ireland's northmost county" , "part of Ireland" , "town and county" , "County of NW Ireland" , "Lean dog (anag) - Irish county" .)