There is a total of 31390 clues beginning with on
- One of two raised when rearing
- One of two regular Mad magazine opponents
- One of two rivers forming the Ubangi
- One of two Roberts
- One of two rolled in a craps game
- One of two sans suit
- One of two school colors (along with heliotrope) of New York's Purchase College
- One of two sharing an apartment
- One of two sibling NFL quarterbacks
- One of two sibling quarterbacks
- One of two sides of a story?
- One of two signs in this puzzle
- One of two single-digit Yankee uniform numbers that aren't retired
- One of two slices of pizza?
- One of two smashing siblings?
- One of two songs on a single
- One of two sound recommendations for a light sleeper?
- One of two spellings of a DEA agent
- One of two states formed during the US Civil War
- One of two states in their own time zone
- One of two states with a Crockett County
- One of two statues outside the New York Public Library
- One of two sts admitted to the Union 11/2/1889
- One of two sts with bordering panhandles
- One of two sultanates in the United Nations
- One of two Supreme Court members appointed by 5-
- One of two sure things
- One of two switch positions
- One of two T's in "TWTWTW"
- One of two talking animals in the Old Testament
- One of two tarot card groups
- One of two teams
- One of two teams to join the NCAA Big 12 in 2012
- One of two test choices
- One of two that kept a close watch on Notre Dame football players?
- One of two that make one
- One of two that makes a king?
- One of two that meet at a cold front
- One of two title characters in a book with one title character
- One of two title roles (in the same film) for Spencer Tracy
- One of two to a dance?
- One of two to four in a standard orchestra
- One of two top actors is ourside prison with some Spanish speakers (5,6)
- One of two Tudor kings
- One of two tumblers
- One of two U S academies
- One of two UN charter members
- One of two US presidents to win a Nobel Prize and a Grammy award
- One of two used facetiously in Mötley Crüe
- One of two using matched weapons
- One of two Virginia signers of the Declaration of Independence
- One of two ways
- One of two with the same birth date
- One of two wives of Henry VIII
- One of two women with three stars on the Hollywood Walk of Fame
- One of two words added to the Pledge of Allegiance in 1954
- One of two worn by Dorothy Gale
- One of two writers
- One of two Yankees whose #8 has been retired
- One of two zygote producers
- One of two, doesn't really matter
- One of two, eg
- One of two
- One of two?
- One of Ty Cobb's record 295 in the AL
- One of US banking's Big Four
- One of Ulysses' men
- One of Uncle Remus's bunch
- One of Uncle Remus's gang
- One of Uncle Sam's battleships
- One of up to 24 on a sunflower sea star
- One of up to four in a tweet
- One of Uranus's moons
- One of us
- One of us, per 60 Across
- One of us, perhaps
- One of us, to an alien
- One of us?
- One of Us?: Abbr
- One of Utah's state symbols
- One of Vandegrift's boys
- One of Vandenberg's men
- One of Vanderbilt's fleet
- One of Vanuatu's islands
- One of Vasco da Gama's ships
- One of Venus de Milo's two that are conspicuous for their absence
- One of Vermont's co-founders
- One of Vermont's founders
- One of very few Fortune 500 companies with a female CEO
- One of Victor Herbert's forty-three
- One of Victoria's prime ministers
- One of Victoria's secrets
- One of Victoria's secrets?
- One of Victoria's titles
- One of Viking Rollo's many names
- One of Visayan Islands
- One of Vishnu's incarnations
- One of Voldemort's horcruxes
- One of Vulcan's workshops
- One of Wales's national emblems