Related Clues:

• Form of a verb
• Unable to relax
• Confusion descriptor
• Emit a sound
• ''That's ___ nonsense!''
• Grammatical time setter
• Temporal language element
• Pluperfect, for one
• Past, for instance
• Stressed-out
• Stressful
• Wired, in a way
• Feeling antsy
• Past, for one
• Tighten (up)