Related Clues:

• Stranger sometimes referred to as 'x''
• United Nations geek backed new 25
• Sadly not many of us save the FT — it's impersonal
• Unidentified - not explored
• Quite obscure - like x
• Lacking a name - having no claim
• Not recognised
• Having no name
• Strange — obscure
• Unspecified organisation has name for director
• Organisation is celebrated as not having been found out?
• Undetermined
• The ultimate in non-celebrity?
• A number to be found anon?
• Obscure; x, say, in equation