Enter a clue or pattern or both:
The Clue
Borrower's backup (8 letter answer)
The Answer
COSIGNER
Tags
Notes
The answer COSIGNER is so rare that it appears less than once every 2500 puzzles.
Definition
COSIGNER as a noun:
1. (cosigner, cosignatory) = one of two or more signers of the same document (as a treaty or declaration)
2. a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety)