Possible Clues:

• Avow or corroborate
• Verify
• I declare it's a company, and sound one
• You'd swear it sounds like company
• Say a business? Say yes
• Make a fair claim that this gets FM
• Certify
• Confidently put a female on top of business
• A note hard to ratify
• Assert publically I've one arm around Fianna F¿il