Affectedly refined (4)
'affectedly refined' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for genteel that I've seen before include "Affectedly refined or respectable" , ""Refayned"" , "Marked by refinement in taste and manners" , "Fashionable" , "Belonging to polite society" .)
(Other definitions for twee that I've seen before include "Affectedly cute" , "Small and sweet (colloq.)" , "Sickly sweet" , "Affectedly pretty" , "Excessively sentimental" .)