Related Clues:

• In knots
• With no slack
• In danger of snapping
• Like a fan belt
• Past or future
• Present, for one
• In good order
• Hardly relaxed
• It may be perfect
• Tightly drawn
• Fully stretched
• It may be past or present
• Like a tuned drumhead
• Nerve-racking
• On the verge of snapping