Possible Clues:

• Help reconcile
• Serve as a mediator
• Come between as mediator
• Come between parties and bury what is to be sown, by the sound of it
• Come between so as to bury what's sown, by the sound of it
• What a mediator might do to bury what is soundly sown
• So to get the sound seed into the ground is to be a mediator
• Plead for sound seed to be put into the ground?
• Pip, say, needing cover first, to act as mediator
• Plead in favour of