Related Clues:

• [A spider!]
• Sound of a mouse pointer?
• Pest-spotting cry
• "Eww, a mouse!"
• Shriek that rhymes with 'shriek'
• Squeak of alarm
• 'You gave me a fright!'
• Cry on sighting 15-Across
• "A snake!"
• Shriek of fear
• Startled squeal
• "OMG a bug!"
• Startled scream
• 'It's a spider!'
• "I see a roach!!"