Possible Clues:

• An open admission
• I, for one, may be heard making positive declaration
• Assertion made in letter I possibly read out
• This affirmation is not consonant with the sound of that sort of a letter
• Statement you or I could be said to make?
• You'd swear that this has the sound of a letter
• Admission for Oval was almost free
• You'd swear it's not consonant sounding
• Admission
• Frank acknowledgement for one from IOU, say