Possible Clues:

• Look at hold up
• Just take a look up at the fortress
• Just take a look at that - don't give it back
• Quick look ... or, read from right to left, 55-Across?
• Christmas Eve taboo
• Look at this a little to get back to the start of 1 across for one
• Quick, sly look
• Furtive glance
• Take brief or surreptitious look
• Dog with twisted tail, look