Possible Clues:

• One included in censure is to lose value
• Faltering trade, piece lower in value
• Protest against absorbing current fall in value
• One boring object to lose value
• Lose value with time
• Express disapproval of one held to lose value
• Disparage Delia's first crepe I chewed and swallowed
• Gradually lose value
• Lose value, being badly rated piece
• Belittle; lose value