Possible Clues:

• Damaged the paintwork when one backed out of
• Having surface damage
• Having scored this, there was no match for it
• Withdrew, slightly injured
• What one did when one felt irritated by such a thorny matter
• Inflicted a minor injury and withdrew
• Pulled out of race, slightly injured
• Erased, like part of 18-, 24-, 51-, and 57-Across
• What a rash thing to have done to have got into a scrape like this
• *Pocketed the cue ball