Possible Clues:

• When a shock is even harder to bear?
• Something winds might cause
• 24 hours during which everything seems to go wrong?
• Good time to change locks?
• Reason to wear a hat ... or what 17-, 27- or 43-Across may describe
• Hard time a coot presumably doesn't have?
• When to expect a nasty shock?
• A dreadful shock this time when everything goes wrong?
• Locks the pits for 24 hours?
• Reviewed, I had a drab year, awful time