| HANGINGGARDENSOFBABYLON | The only one of the "seven wonders" whose existence has never been proved |
| DELTAFORCE | Special operations unit whose existence has never been confirmed by the U.S. government |
| GOTYE | Belgian one-hit wonder whose one hit was "Somebody That I Used to Know" |
| ANSELM | Theologian whose 'proof' of God's existence has prompted great debate - he died at Canterbury in 1109 and was made a saint (6) |
| ESSE | Real existence has its ups and downs (4) |
| GIZA | The Great Pyramid of ____: the only one of the Seven Wonders of the World still standing. (4) |
| CAIRO | Capital near the only one of the Seven Wonders of the Ancient World that's still largely intact |
| FIRE | Wind at work: It's the only one of the natural elements that is spread by one of the others |
| BEARD | Dopey is the only one of the Seven Dwarfs without one |
| MICHIGAN | Lake ... is the only one of the five Great Lakes of North America that lies entirely within the Unit |
| SEASONS | Fall is the only one of the four that has two names |
| FALL | It's the only one of the four seasons that has two names |
| GINGER | The only one of the 2/19 whose name was a 2? (6) |
| PENNSYLVANIA | The only one of the USA's original 13 states with no Atlantic coastline |
| THEOREM | It's been proved the other side has snatched product of mine |
| TRON | Film with the tagline "A world inside the computer where man has never been. Never before now." |
| ION | Any one of the electrically charged atoms whose existence in emeralds, garnets, rubies, sapphires etc is central to said gems' colouration (3) |
| SOLE | Only one of the denizens of the deep (4) |
| TRAM | In Adelaide, what type of public transport, the only one of its kind in the city, links Victoria Squ |
| UNICORN | Place to study bad jokes, the point of which has never been perceived |
