Related Clues:

• Beyond them it's no go to have it in so slim a way for them
• Fifty-one thousand, so it is; that's the end of them
• I'm in a list but they're at the end
• I'm in the lists at last
• I'm in the slit in the end
• Fifty I am before it has reached the ends
• Can't go beyond them to make it slim for them
• Secretary, e.g
• Inbox locale
• Points beyond which one may not go
• Seems I'm in the slits - couldn't be more so
• It may have a nameplate mounted on it
• Something to work on
• One's no right to go in off them
• Without these I'm it