Related Clues:

• Ebb --
• Motion of the ocean
• Ebbing thing
• Sand castle destroyer
• Fab alternative
• High or low phenomenon
• The water's swell
• Oceanic phenomenon
• Neap or 66-Down
• Bay of Fundy phenomenon
• Beach cover-up?
• Periodic riser
• Frequent beach visitor
• To-and-fro flower
• Sand castle inundator