Possible Clues:

• Glow from reflection is ultimately lost in valley
• Let sing (anag) — shine
• Shimmer of gold, initially — pay attention
• Shine, having first to break depression
• New singlet may gleam
• Shine or sparkle
• What icicles do in the sun
• Show brightness — if L is two and G is five, then ...
• It's good to pay attention and look bright
• Information masters are inclined to shine