Possible Clues:

• Colour Zeiss perhaps introduced to series
• Bright red often associated with sin
• Mark from a wound allowed to become red
• Red alert — revolution succeeds, say Communist leaders
• Red colour
• Reddish color
• Southern refined claret is a brilliant red
• Immoral shade like 5 across?
• Fallen, little evidence of injury?
• Colour of little wound?