Related Clues:

• Appreciated Broadway letters
• Audience warning, briefly
• Theater sign (Abbr.)
• BO advisory
• 'All seats are taken' abbr.
• BO sign
• Sign outside a hit show
• Heavenly sign for an angel?
• Hit sign letters
• Sign of a Broadway smash
• 'No seats'
• 'Rent' sign, say
• Sign of a crowd
• Smash sign
• Letters angels love?