Related Clues:

• Pushing the envelope
• Like a bundle of nerves
• Innovative and daring
• Out there, in pop culture
• Form of a verb
• Hardly loose
• Unable to relax
• Appealing to feelings
• Stretched to the max
• Like violin strings
• Having no slack
• Nervous as a cat
• Controversial
• Grammatical time setter
• Temporal language element