Related Clues:

• Having no slack
• Grammatical time setter
• Temporal language element
• Pluperfect, for one
• Past, for instance
• Stressed-out
• Fully extended
• Stressful
• Wired, in a way
• Feeling antsy
• Past, for one
• Tighten (up)
• Like a tuned piano string
• In need of a massage, maybe
• Like a high wire