Related Clues:

• Rigid
• Not at all relaxed
• Fidgety
• Stressed
• Past perfect, for one
• In need of a massage
• Knotted up
• Brace, in a way
• Present, e.g.
• It can be past or present
• On tenterhooks
• Drawn tight
• All wound up
• Ex-lax?
• Tightly stretched