Possible Clues:

• Without a scratch -- not hard when opponent is this?
• Defenceless like the Venus de Milo?
• Having no weapons and lacking ability to punch, say?
• Defenceless? Not 'urt
• Defenceless as Venus de Milo?
• Defenceless woman's right by the sea
• Defenceless Cockney's not hurt
• Venus de Milo is so defenceless
• Maybe defenceless, but not hurt when husband leaves
• Without heat, so to speak