Related Clues:

• Keep secret, skin
• Place to observe wildlife in park's sound
• Mammal's tough skin
• Move secretly
• Reportedly a doctor's alter ego's cloak
• Wait in ambush
• Wig's removed at first to reveal skin
• Not show two-thirds of holidaycamp programme?
• Leather mask
• Lie in ambush
• 23 hosting One Direction's first show? No
• Sneak around
• Harbor, e.g
• Keep quiet about outlandish idea's content
• Screen; skin