Possible Clues:

• Bombshell
• This surprises greatly - makes you look
• Fact that brings great surprise, dilating optics
• Fact that surprises or enlightens in optical way
• Revealing thing - a matchstick?
• Watch batsman causing surprise
• Surprise Eeyore, wandering around enclosure
• It's startling for whoever raises the lid!
• Seems sleep could never be such a surprise
• It lifts the lid on a big surprise