Related Clues:

• Having no slack
• Nervous as a cat
• Controversial
• Grammatical time setter
• Temporal language element
• Not at all serene
• Pacing, perhaps
• Pluperfect, for one
• Past, for instance
• Stressed-out
• Fully extended
• Stressful
• Wired, in a way
• Complimentary adjective for a comedian
• Feeling antsy