Possible Clues:

• Locks to secure old books? That's silly talk!
• Guff
• All talk, no action
• Empty talk from the first three characters in 26 across on radio
• Balloon type
• Vapid talk from entertainer with no small appearance
• Locks securing books and eyewash
• Bloviator's contribution
• What blowhards blow
• It's a concern for one making cuts holding onto good books or is that just empty words?