| Text | Length |
| One in a highchair | 18 |
| Oft-revered symbol | 18 |
| Of a tribal spirit | 18 |
| Of imposing height | 18 |
| One-seated vehicle | 18 |
| Oregon or Santa Fe | 18 |
| Oregon or Chisholm | 18 |
| Oregon or Sante Fe | 18 |
| Oregon or Overland | 18 |
| Off-roading option | 18 |
| Orderly succession | 18 |
| One being mentored | 18 |
| Overhead transport | 18 |
| Old London transit | 18 |
| Oil-pipeline route | 18 |
| Overly sweet stuff | 18 |
| October 31 handout | 18 |
| One buying a round | 18 |
| Overstep the line? | 18 |
| Opening of an ode? | 18 |
| Of an allied group | 18 |
| One of a bridge 13 | 18 |
| Obstetrical period | 18 |
| Often heard before | 18 |
| On-line instigator | 18 |
| One-time streetcar | 18 |
| Old college thing? | 18 |
| On-the-sly meeting | 18 |
| Old Russian despot | 18 |
| Old Russian dynast | 18 |
| Old Russian royals | 18 |
| Old crowned heads? | 18 |
| Old line in Russia | 18 |
| Oompah band member | 18 |
| Old Roman trumpets | 18 |
| Oompah instruments | 18 |
| Ointment container | 18 |
| Old English coach? | 18 |
| One-on-one student | 18 |
| One-on-one learner | 18 |
| One-to-one learner | 18 |
| One-on-one scholar | 18 |
| One-on-one teacher | 18 |
| Online help, often | 18 |
| Orchestral passage | 18 |
| Outfit for Pavlova | 18 |
| Old name in travel | 18 |
| Old carrier inits. | 18 |
| Opening for light? | 18 |
| Old draft category | 18 |
| Oppressive regimes | 18 |
| Omagh's county | 18 |
| OPEC member: Abbr. | 18 |
| Old Mideast inits. | 18 |
| Old Eg./Syr. union | 18 |
| Over, in Oldenburg | 18 |
| Over, in Offenburg | 18 |
| Over, in Offenbach | 18 |
| One of a wolf pack | 18 |
| Ocean menace, once | 18 |
| Officer under Kirk | 18 |
| Opposite of radial | 18 |
| One kind of motive | 18 |
| Opposite of infra- | 18 |
| Ob/gyn's image | 18 |
| One, in Portuguese | 18 |
| Obstruction caller | 18 |
| Oft-booed official | 18 |
| Official in a mask | 18 |
| Officiated at Shea | 18 |
| Open the barn door | 18 |
| Open, as a package | 18 |
| Open a soda bottle | 18 |
| Open the champagne | 18 |
| Open, as shoelaces | 18 |
| Open, as a necktie | 18 |
| One, in Orléans | 18 |
| One, in the Louvre | 18 |
| One, in St. Denis | 18 |
| One of the French? | 18 |
| Open up, as a flag | 18 |
| Opened to the wind | 18 |
| One-legged support | 18 |
| One-piece garments | 18 |
| One that makes one | 18 |
| Oneness of opinion | 18 |
| One of the Spanish | 18 |
| Open up, as a tomb | 18 |
| Opens, as a letter | 18 |
| Ousted from office | 18 |
| Oldest Indy winner | 18 |
| Opens, as a bottle | 18 |
| One in numismatics | 18 |
| Open, as a present | 18 |
| Open for Christmas | 18 |
| On the higher side | 18 |
| One who extirpates | 18 |
| On the floor above | 18 |
| Of a Russian range | 18 |
| One of eight popes | 18 |
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