Possible Clues:

• It goes out regularly
• It may wash away castles
• The tiller is in this in a knot, by the sound of it
• 'The ___ stayeth for no man': William Camden
• Subject of some tables
• Note I would be in season
• Edna O'Brien found she could make a theme of it, given time
• By the sound of it, not going in and out
• An odd diet for the festive season
• Geophysics topic