Related Clues:

• Add your name to another's, as for a loan say
• Back up, as a loan
• Help to get a loan
• Help to secure a loan, maybe
• Endorse for a loan, perhaps
• Help in securing a loan
• Guarantee, as a loan
• Vouch (for), in a way
• Jointly endorse function over the phone
• Jointly endorse function for broadcasters