Possible Clues:

• Sets __ for (tries to catch)
• Set __ for: lure
• Set (try to catch)
• "It's __!": warning shout
• Set ___
• Set -- for (try to catch)
• 'It's ___!' (crook's cry)
• Fall into __ (get caught)
• "It's ___!"
• Like a rat in ___