Possible Clues:

• What a nuisance the French is with mortar
• Instrument for pounding spices etc
• The nuisance with the French for work in mortar
• What a nuisance to make ground with the French!
• Pulveriser of nasty insect left on back of house
• What a nuisance for the French to stamp it in mortar
• Tool for pounding
• It begins to be a nuisance to work with mortar
• A grinder or pounder
• That makes ground for the mortar