Possible Clues:

• Be a mediator and bury the seed, by the sound of it
• Plead for someone
• Petition to put seed into the ground, say
• Mediate -- in tribunal, initially decree differently
• Plead to dine out over monastic service
• Step in plant root to be picked up
• Intervene on behalf of another
• Moderate cider teen's drunk
• Bury give up and act as peacemaker
• Petition fencing knight errant recited, all over Spain