Possible Clues:

• Iffy film from the 1970s
• & 15 Across No tsunami perhaps in range of North America
• Title film character who declares 'Nobody owes nobody nothing'
• Difficult — as peak may be?
• These mountains tending to shake?
• Stallone's fighter unstable
• Best Picture winner from 1976
• Hard, finding clubs in New York
• Far from smooth
• ___ Mountains (range through Colorado)