Possible Clues:

• Having ups and downs, in a way
• Of ocean motions
• Ebbing and flowing? It''s time the girl left
• Of neap and ebb
• In the ballad it runs westward, ebbing and flowing
• Word with pool or wave
• Regulates water for young man looking back at it
• Cyclical, at the beach
• Word with bore or basin
• Word with basin or flat