Possible Clues:

• Athlete who wears gloves
• One serving punch? ... or, parsed differently, a hint to 12 squares in this puzzle
• Taylor or Harrington, say
• See 104-Across
• One likely to whine, produce howl or jabber?
• Athlete in a ring
• Lightweight or heavyweight dog?
• Lightweight worker in goods packing?
• Ring master?
• Pugilist; dog