Possible Clues:

• It waits for no man
• Bound, they say, to ebb and flow
• The water diet?
• Period of time - spring, for example
• Trend lashed in speech
• It waits for no man, purportedly
• It may be turned against you
• Sounds as it it's not Ed, by the sound of it
• Surfers monitor it
• Sand castle's enemy