Possible Clues:

• Releases United fixtures after noon
• Undoes, loosens a knot
• Undoes knot
• Opens knot to release
• A loosens like this to a relative extent
• Gets the tide out, by the sound of it
• A loosens like this, relatively so
• When one does this, no longer not, by the sound of it
• Frees mum's sisters from a slow start
• Sets free