Possible Clues:

• Underlying intention
• The French have a word for it - I have too
• Reason for doing something - crime?
• The French have a word for it and I have the end of it and it all has the reason for it
• Reason for committing a crime
• Car test I have for good reason
• Why leave your home? It is heartbreaking
• Reason why the French have a word for it, I have, too
• The French have a word for this reason for doing it, and I have too
• The French have a word for why you do it, and I have as well