Possible Clues:

• Characters in panto use lewdness, getting the bird
• Ineffective large bird?
• Bird originally obliged to avail itself of lake
• Diver, topless, put up with looks at first
• Bird in building not hard to find by lake
• Bird in roofless building overlooking lake
• Bird left to go south of river
• Form of louse, one with wings
• Bird trapped by enormous elephant
• Diver to employ in round pool, ultimately