Possible Clues:

• Caution and worry after holiday is put back
• Beware of the hole in the rocks at this
• A warning against certain acts
• Warning that there's an opening at this point
• Grotto beside reservation
• Proviso, warning
• Warning to vacate compound
• Is pussy giving one warning about the hail?
• Let the buyer beware ...emptor
• There's a warning for the speleologist at this point