Related Clues:

• Serious damage to one's reputation
• Russian autocrat's not left mark
• Rug ruiner
• Stuff on the deck
• Blemish on a rug
• Blemish; colour (wood)
• Mark, showing stress, runs away
• Wrong to accept thanks for blemish
• Tide may wash it away
• Bring discredit upon
• Mostly remain in disgrace
• Unwanted spot
• Sofa mishap
• It's an odd discolouration
• Bio lab preparation