Possible Clues:

• Ebb and others
• Diets (anag.)
• Sited (anag.)
• Lunar-driven movements of oceans
• Helps through a tough time, with "over"
• Such highs and lows raised in omnibus edition
• Sea fluctuations
• They have their highs and lows
• They get high on the beach every day
• Sports editors return to cover the highs and lows?