Possible Clues:

• Individual in sleeveless vest, taking time off
• Clerical error finds most of 10 across is from the chipper
• Unique mass of pebbles that's not hard
• Small fireplace sufficient for one
• One espousing leather trousers?
• The hit in the baseball mantra "A walk is as good as a hit"
• The hit in the baseball mantra 'A walk is as good as a hit'
• Lone record
• Individual transgression leads to joy being curtailed
• One bad deed leading to a lot of fun