Possible Clues:

• To do with movement of seas
• Having ups and downs
• The young man turns up with it, going in and out
• Tied, by the sound of it, back to the boy with it
• Big kind of wave
• Word with wave or pool
• Descriptive of a great sea-power
• The boy turns to it up and down the water (5)
• Young man with special quality making a comeback, subject to regular surges
• Concerning the rise and fall of the sea