Related Clues:

• Go on and on
• Chatter
• Prattle
• Talk nonsensically
• Nonsense talk
• Babble
• Talk incessantly
• Yak
• Talk on and on
• Talk nonsense
• Be a chatterbox
• Yap
• Talk on and on, and a hint to the three-letter starts of 16-, 22-, 43- and 51-Across
• Talk fast
• Talk quickly and indistinctly