Related Clues:

• Apt to snap
• Type of roof
• When doubled, start of a cheer
• 'Lord Jim' or 'Lucky Jim'
• 'I'm ___'
• Trend-setting
• John Grisham work
• Not at all calm
• Liable to snap
• When repeated, start of a cheer
• Hitherto unknown
• Touchy
• Original
• London production
• Provocative