Related Clues:

• There's not a single thing like it
• Are is this
• See 21 Down
• Mice or men
• Like mice and men
• No single word will fit here
• Empty 9 alongside Russian river, or rivers possibly?
• Indicating more than one
• Numbering more than one
• More than one in number
• Word form made with the big letter depicted in this puzzle's diagram (this letter is entirely absent from the solution)
• Men or women, e.g
• Word ending in 'L' for words ending in 'S'?
• Deer or elk, sometimes
• Doesn't describe single place beside old city to gangster