Related Clues:

• Verb form
• Grammar concern
• Far from laid-back
• Form of a verb
• Unable to relax
• 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)