Possible Clues:

• It has heddles and treadles
• Historic Williamsburg machine
• Appear ominously close to depression -- not good
• Woolgatherer?
• __ large
• 'Appear as a vague form, perhaps threatening (4)'
• Mill machinery no good in poor light
• Shuttle spot
• Power ___, invention of Edmund Cartwright, ca. 1785
• Impend; weaving machine