Related Clues:

• Square divisible by two
• Like 4, but not 5
• Regular flat
• "I literally can't ___!"
• Level, regular
• Like some numbers and scores
• Like e.g. two, four, six and seventeen? Not entirely
• Flat, uniform
• Fixture, not ending all square
• Number, all except leader, in uniform
• Calm – and well-balanced
• Like 12, 14 and 16
• Neck-and-neck, in a race
• Flat in Stevenage
• "I can't __"