Related Clues:

• Quick, secret look
• Look before Christmas
• Look shyly between one's fingers
• Quick look as dog is heard
• Appropriate rhyme for sneak
• Tentative look
• A secret look
• Have a gander to hold back
• Look to carry on in recession
• Cheat at cards, say
• Quick look ... or, read from right to left, 55-Across?