Related Clues:

• Alter the water to flow upwards
• Might one alter this so as to make the water flow up?
• Did the water flow up here? This can change that
• To make the water flow up, you'd have to change it like this
• Do this for a change and see 12 across
• This may change with the turn of the tide
• Water flows the wrong way, just to make a change
• Make a correction to the turn of the tide
• If it flows the wrong way, alter it
• How water flows up over the paper
• Alter this with the turn of the tide
• The water is coming up, so change it for the better
• What goes in and out goes up here
• Tied up, by the sound of it, for a change
• That will make a change for the water to flow the other way