Related Clues:

• Yaks and yaks
• Ties up a phone line, maybe
• Chews the rag
• Uses up one's minutes, perhaps
• Talks and talks and talks
• Bats the breeze
• Up for __ (gossipy?)
• Is a yakker
• Chats a lot
• Runs on
• Speaks freely
• Acts loquaciously
• Just keeps talking
• Starts to gossip and blather senselessly
• Chats away