Related Clues:

• How the French louse turns up from Italy (5)
• The French can be spoken in Rome
• Tongue used to be a pound a can
• The French can get this from Rome, in a manner of speaking
• The French can from Rome may be tongue
• The French can not be French
• The classical way to have been lying about tea
• The French 27 across is not in French
• The French can be not in French
• An old tongue was lying about a little tea
• Like many mottoes
• Hogwarts motto language
• Julius Caesar's language
• With 42-Across, one who might memorize 64-Across?
• Source of much legalese