Enter a clue or pattern or both:
The Clue
Assure payment of a promissory note (6 letter answer)
The Answer
COSIGN
Tags
Notes
The answer COSIGN is so rare that it appears less than once every 2500 puzzles.
Related Clues
Help to secure a loan, maybe
Back up, as a loan
Back another's promissory note
Definition
COSIGN as a verb:
1. (co-sign, cosign) = sign jointly; "Husband and wife co-signed the lease"
2. (cosign, co-sign) = sign and endorse (another person's signature), as for a loan