Possible Clues:

• Revolutionary period contributing to havoc, to be realistic
• Only child runs about to be in time for Hallowe'en
• One-time eighth month
• The Hunt for Red . . . . . . . (film)
• Leaf-raking month
• Red submarine launched by Tom Clancy
• Big month for beer festivals
• Cot robe for the month
• To be orc (anag)
• Bierfest time