Related Clues:

• Backer's hope
• Theatrical hit
• Batter's success
• Successful song
• Mob killing
• ... tennis players who moonlight as army surgeons?
• Smite
• #1 hit
• Angel's hope
• Top tune
• Red peg, in Battleship
• Platinum record, for sure
• With 18-Across, be unsportsmanlike, literally
• Megahit
• Hit show