Possible Clues:

• Metaphor for a repetitive person
• Damaged vinyl, or what 19-, 27- or 46-Across suggests?
• Repetitive person
• That one who never stops going on and on shattered by new personal best
• That one going on and on went to pieces at memorial
• Goes on and on like this as Bannister's mile clocked at 3.54.9 currently
• Good news for an Olympic athlete, bad news for a disc jockey
• Metaphor for annoying repetition