Possible Clues:

• 'Liza With a Z' songwriter
• Even though tied soundly, one can still go out (3)
• Channel swimmer losing head in adverse tide
• By the sound of it it's not tied in
• Dwindle down
• No flow
• Be up, be little, be going out
• Flow outwards
• This comes after it''s tied up, by the sound of it
• Might get wed about the tide with duck's feet