Possible Clues:

• Exaggerated story
• Yarn that can come out of your mouth (2 words)
• Exaggerated yarn (2 words)
• It's hard to believe 10 across is with tenor on the beer
• Common bit of folk lit
• Huge report is long shot that could be true
• Story involving Pecos Bill or Babe the Blue Ox
• Fanciful story
• Quite a yarn
• Everyone in teetotallers is on the beer? That's an example of a great whopper!