Related Clues:

• One to one, e.g
• The facial index is one
• 4:1, e.g
• 9 to 5, say
• Betting odds, e.g
• 9 to 5, e.g
• The proportion of numbers the TD exchanges for the radio?
• 10:1, e.g
• There's often a colon in one
• It has a colon in the middle
• Tangent, e.g
• See 5
• Supply restricted in proportion
• Separationist has covert relationship
• Say, one to five in operation