Possible Clues:

• Instruct what's so bright between one headless fowl and the other one
• Teach development in the glen
• School spaces filled by conspicuous person
• Show how to make it less heavy, perhaps
• Instruct crew, seen regularly round Northern Line
• Open someone's eyes to Hawaiian goose coming back over match
• Inform one that one may switch it on, perhaps
• Provide illumination in the ginnel that's rather obscure
• Apprise
• Instruct goose soaring and circling to come down