Well-mannered man entertains women in Welsh county (5)
I believe the answer is:
gwent
'welsh county' is the definition.
(I've seen this before)
'well-mannered man entertains women' is the wordplay.
'well-mannered man' becomes 'gent' (I've seen this in another clue).
'entertains' indicates putting letters inside.
'women' becomes 'w' (standard abbreviation).
'gent' placed around 'w' is 'GWENT'.
'in' is the link.
(Other definitions for gwent that I've seen before include "Blaenau - is a Welsh county borough" , "former Welsh county" , "Preserved county of Wales" , "Region of SE Wales" , "part of Wales once" .)