Related Clues:

• Sing Dufourspitze-style
• Warble
• Advocate
• Alpine call
• A cast may take it
• Mountain song
• Quitting time, for some
• Echo producer, maybe
• Kin of a Ho-Ho or a Ring Ding
• Skilled performer
• Alpine sound
• One in ___ (20%)
• Sing the Alpine way
• Quitting time, perhaps
• Number