Possible Clues:

• He once had stable work on TV
• Vocal nag
• First-of-a-kind 1960's TV star
• Nick at Nite rerun
• He was more than a neigh-sayer
• Early 60's TV listing
• 1960's TV horse
• Wilbur's charge in 60's TV
• Wilbur Post's charge
• He talked to Wilbur Post