Related Clues:

• It precedes 15
• See 36-Across
• Nothing on the court
• Be gaga over
• Troubadour's subject
• Be wild about
• Romance
• See 52-Down
• It means nothing to some people
• Zero, on a court
• Love letters?
• It 'makes the world go round'
• Torch song subject
• Letter sign-off word
• Score in a pointless game?