Related Clues:

• Habitual jerk
• Hair color, for example
• Essential quality
• Stubbornness or kindliness, e.g.
• Brown eyes or baldness, e.g.
• Colorblindness, e.g.
• "Space ___" ("Ground control to Major Tom" song)
• Roman nose, e.g.
• First of three O's, perhaps
• Eye color, e.g.
• -- Tac (breath mint)
• Start of a grid game
• Strange thing
• Habitual spasm
• Small spasmodic reaction