Possible Clues:

• Object of fear
• Object of anxiety
• Cause of worry
• Imaginary source of fear, or the title of a 1999 Destiny's Child hit
• Pester one, sound disapproving with cause for anxiety
• Bête noire
• 'No fustian about church-yards, no -- tales' (E. A. Poe, The Premature Burial)
• Imaginary object of fear
• Just about keep afloat, touring most of African republic, which makes one anxious
• One of 10 across, as one might say to a goose, fearfully