Related Clues:

• ... that requires this
• Sitcom housewife Donna
• Thatcher's need
• Woodwind part
• Beethoven piece
• 'The Brady Bunch' star
• English horn, for one
• Oboist's need
• One of two in a bassoon
• 14 Across accessory
• One of many by Beethoven
• Exemplar of flexibility
• Tall grass
• Thatch bit, perhaps
• Saxophone, e.g.