| IRIS | Girl in Sinclair Island |
| LEORA | Martin's first wife in Sinclair Lewis' 1925 novel Arrowsmith |
| ZENITH | Presumably this is the highest city in Winnemac, a fictional US state in the Sinclair Lewis novel Ba |
| ELMER | Name in a Sinclair Lewis title |
| NOBEL | Sinclair Lewis won one for Literature in 1930 |
| UPTON | Municipality in Quebec; or, American author Mr. Sinclair |
| ELMERGANTRY | Sinclair Lewis novel satirising evangelism, filmed in 1960 |
| DINO | Green critter in the Sinclair gas logo |
| SLUM | Environs in an Upton Sinclair work, usually |
| JUNGLE | "The ...", Upton Sinclair novel set in the Chicago stockyards (6) |
| HGWELLS | Sinclair Lewis nominated him for the 1932 Nobel Prize in Literature |
| MAINSTREET | 1920 Sinclair Lewis novel set in the town of Gopher Prairie, Minnesota (4,6) |
| STREET | 1920 novel by Sinclair Lewis set in Gopher Prairie, Minnesota (4,6) |
| MAIN | 1920 novel by Sinclair Lewis set in Gopher Prairie, Minnesota (4,6) |
| CALEB | Actor who plays Lucas Sinclair in Stranger Things, _ Mclaughlin (5) |
| LEWIS | Sinclair ?, winner of the 1930 Nobel Prize in Literature |
| OIL | ___!, novel by Upton Sinclair, published in 1926-27 (3) |
| RHONAMITRA | London-born actress who starred as Eden Sinclair in 2008 action film Doomsday (5,5) |
| ANN | '___ Vickers' (Sinclair Lewis novel) |
| ESSO | Former Sinclair competitor |
