Possible Clues:

• Peculiar quality
• Eccentricity
• Peculiarity
• Prime property, apart from 2
• Idiosyncrasy
• Eccentricity of old clergyman seen by Scottish lake
• Curious state
• Eccentricity of uneven quality
• It isn't even a peculiarity of character
• Characteristic of one pair of diamonds among one pair of spades