Possible Clues:

• One running in fashionable circles
• Thus spies possibly skinny party grandee?
• Regular partygoer
• Sailor from the East spies skinny partygoer
• Breaking ice a lot is — part of one’s lifestyle?
• On backward Greek island, I got off with European jet-setter
• One of the fashionable classes
• One living high life therefore spying group in weakened form?
• Partygoer getting red sequence at last discarding spades ...
• Agents trapped by criminal lies to a well-connected person