Answer:

proper

Answer	Crossword Clue
PROPER	Suitable
PROPER	Like a British gentleman
PROPER	Fitting partner

PROPER	Prim partner
PROPER	Decorous
PROPER	Correct
PROPER	Seemly
PROPER	Like capitalized nouns
PROPER	Like Huck and Yosemite, nounwise
PROPER	Polite
PROPER	Well-mannered

PROPER	Meet.
PROPER	"The ... Bostonians."
PROPER	Seemly.
PROPER	Suitable.
PROPER	Decorous.
PROPER	Fitting
PROPER	Kind of noun
PROPER	Fit; suitable

PROPER	Meet
PROPER	Genteel
PROPER	Right
PROPER	Capitalized, as a noun
PROPER	Appropriate to the occasion
PROPER	Following etiquette
PROPER	Like some nouns
PROPER	Fit

PROPER	Excluding the suburbs