Related Clues:

• Three, to Amati
• Jr.'s son, sometimes
• Number between due and quattro
• One past due
• Certain numero
• Article of the Constitution about the judiciary
• Half of VI
• Un numero
• IX square root
• 'Uno' + 'due'
• See 87-Across
• The last King Richard of England
• Low numero
• XXX ÷ X
• Three, in Italy