Possible Clues:

• Area of central London
• Fashionable London area
• Fashionable district in London
• Most expensive property on a Monopoly board
• Billy --, USPGA tour golfer and winner of the 1987 US Amateur Championship
• London area needing spring clean
• London district featured in 'Marnie', at first always fine and dry
• Can just make fashionable district
• Lady pulls out of musical film, keeping a quarter of the capital
• Hyde Park neighbor