Answer:

ONE

Answer	Crossword Clue
ONE	20% of a fin
ONE	"A Chorus Line" number
ONE	"My .. and Only"

ONE	"..-Trick Pony" (Paul Simon film)
ONE	"... for the money"
ONE	10% of a sawbuck
ONE	1969 Three Dog Night hit
ONE	Change-machine input
ONE	Hole in ....
ONE	Italian noble family
ONE	Liftoff preceder?

ONE	Mike-tester's first word, often
ONE	Singular
ONE	Upright figure?
ONE	Washington's whereabouts
ONE	Where Washington is
ONE	Word on a dollar
ONE	"All for ... ..."
ONE	"All for ..., ..."

ONE	".. Fine Day"
ONE	1300 hours
ONE	Area-code preceder
ONE	Half and half
ONE	Hydrogen's number
ONE	Like no other
ONE	Low number
ONE	Series opener

ONE	Small bill
ONE	The loneliest number
ONE	Three Dog Night hit
ONE	Undivided
ONE	United
ONE	Washington's note
ONE	Word on a penny
ONE	"... Bad Apple" (Osmonds hit)

ONE	First number
ONE	Impossible craps roll
ONE	Single
ONE	It's better than nothing
ONE	... World Trade Center