Possible Clues:

• They cut ground from under someone's feet perhaps with fish bait
• They get hooked by fishy types with dirt on Labour mostly from manuscript
• Mares worth breaking, although lowly creatures
• Wriggly little creatures
• Heard the son's neighbour dispute review on manuscript by those doing good plot work
• Creatures ruining the marrows
• Creatures that ruin the marrows?
• Garden aerators