Possible Clues:

• Comedy actor otherwise engaged by Walkabout Inn?
• Danish composer finding diarist's otherwise engaged
• Composer - one otherwise engaged between notes?
• 'Airplane!' cast member
• Ebert called him 'the Olivier of spoofs'
• Carl -, Dan. composer
• Sentinel half-heartedly disturbed composer
• Composer redrafts ten lines cutting out tenor initially
• Kurt, a great Dane of Wimbledon
• Miserable Les; no German holds with backing this composer