Related Clues:

• Past, for one
• Like avant-garde art
• Tighten (up)
• Like a tuned piano string
• All nerves
• Uneasy
• Far from conventional
• In need of a massage, maybe
• Like a high wire
• Not at all cool
• Linguist's subject
• In need of a rubdown
• Cliff-hanging
• Not loosey-goosey
• Having butterflies