Possible Clues:

• Mission may be sent out to capture Hitler's bodyguard
• English male singer's unknown mission
• State's foreign outpost
• Office of an ambassador
• With facility that's extra small inside incorporating doctor's official residence
• A couple of seconds to break into complex maybe — that's the mission
• Diplomat’s digs
• English male singer with yen for diplomatic office
• Bernard Manning ran the ____ Club in Manchester
• Diplomatic establishment