Related Clues:

• Far from laid-back
• About to snap
• Pushing the envelope
• Like a bundle of nerves
• Innovative and daring
• Out there, in pop culture
• Form of a verb
• Unable to relax
• Nervous as a cat
• Controversial
• Grammatical time setter
• Temporal language element
• Not at all serene
• Pacing, perhaps
• Pluperfect, for one