Related Clues:

• Whiter than white is very non-U
• UN's not involved in fundraising - somehow unbecoming
• Facing prospect of an excavation with nothing to lose - it's beneath one
• No Greek character is socially unacceptable
• A shade off colour writing in French a Latin term
• A derringer initially firing shot beneath someone
• Far out wearing violet-blue, almost demeaning
• Outside limits of social convention
• Such as one would not stoop to
• Beneath oneself (from Latin)
• Morally or socially intolerable
• Past proper limits
• If darling gets left out in dance that's unbecoming
• Socially insensitive, perhaps
• Bourgeois, to Brits