Related Clues:

• Dog-paddle, say
• Go with the flow?
• Sidestroke, e.g.
• Thick of things
• Go through channels?
• Do laps, perhaps
• Do the butterfly
• One way to travel by sea
• Stroke, stroke, stroke...
• Pool exercise
• Sink alternative
• Come crawling back?
• Go down a lane, maybe
• Partner of sink
• Make for shore