Related Clues:

• 'Negative'
• Grunts meaning 'No way!'
• Definitely not what inactive pupils want on timetable?
• 'Don't even go there!'
• 'Won't work'
• "Yup" opposite
• 'Keep dreaming'
• Work in Northumberland? Emphatically not!
• 'Ain't happenin''
• 'That's not true!'
• "Not happenin'"
• ''Ain't gonna happen''
• "Nah"
• Disapproving remark
• Casual refusal ... and, another way, a hint to this puzzle's four longest answers