Possible Clues:

• Look when no one's looking
• Spoil a surprise, perhaps
• Something not to do before Christmas?
• Take camera from peacemaker for a quick look
• Look, it’s the Speaker’s dog!
• Be naughty on Christmas Eve, say
• Look from castle towards the north?
• Take a look, in a way
• Break a yuletide rule
• Repeatedly look like this, say, to annoy top dog?