Related Clues:

• Fell from bird-watchers' retreat
• Having a hundred-odd acres, so bound to be conventional?
• Herbie, ex-heavyweight champion
• Herbie, who won a version of the world heavyweight title
• Keep secret, skin
• Place to observe wildlife in park's sound
• Mammal's tough skin
• Reportedly a doctor's alter ego's cloak
• Wig's removed at first to reveal skin
• Not show two-thirds of holidaycamp programme?
• Leather mask
• 23 hosting One Direction's first show? No
• Harbor, e.g
• Keep quiet about outlandish idea's content
• Screen; skin