Related Clues:

• Relative of the English horn
• See 27-Across
• Hamlet, e.g.
• Double-reed instrument
• Cousin of a clarinet
• Lady Macbeth, for one
• Position
• Its pitch is high
• Purpose
• Cameo, maybe
• Mitch Miller's instrument
• Part to play
• Woodwind
• Part
• 'O' in old radio lingo