Possible Clues:

• What a nuisance for the French to stamp it in mortar
• Tool for pounding
• The English nuisance works with mortar with the French
• Small club for pounding substances in mortar
• What a nuisance the French can be with a mortar
• It begins to be a nuisance to work with mortar
• Starts to be a nuisance for one to work with mortar
• Mortar go-with
• What a nuisance for the French to work with mortar!
• That makes ground for the mortar