Crossword Clue:

A promissory note an IOU

AnswerCrossword Clue
IOUPromissory note, of a sort
IOUNot quite a promissory note.
PROMISEEParty to a promissory note.
IOURelative of a promissory note.
IOUPromissory note of a sort
MARKERPromissory note in a casino
COSIGNAssure payment of a promissory note