Related Clues:

• Is not so much what you're taught, by the sound of it (7)
• Let there be fifty such; it makes it less difficult
• Gets less like this
• This flows the other way
• If D is ahead of them, well, they're not
• E's getting slack about the sea
• Lets them follow these when they're not so tight
• See about as to how one gets slack
• Goes back to sea?
• Decreases gradually
• Marine retreats?
• Tides favored for boating departures
• Recessions
• Turns mild
• Flows away