| Online tech-news source | 23 |
| Online technical news source | 28 |
| Online tracking devices | 23 |
| Online travel reservation | 25 |
| Online university extension | 27 |
| Online university staff? | 24 |
| Online university suffix | 24 |
| Online used vehicle dealer | 26 |
| Online user's self-image | 28 |
| Online video equipment | 22 |
| Online voice calling service | 28 |
| Online-only publication | 23 |
| Only a bit in debt, perhaps | 27 |
| Only a drug of forgetfulness? | 29 |
| Only a stone's throw away | 29 |
| Only Adam and Eve lacked them | 29 |
| Only ape to circle the earth | 28 |
| Only beardless Disney dwarf | 27 |
| Only Canadian MLB team | 22 |
| Only creature that blushes | 26 |
| Only daughter of Elizabeth II | 29 |
| Only even prime number | 22 |
| Only female attorney general | 28 |
| Only four-letter Great Lake | 27 |
| Only inanimate zodiac sign | 26 |
| Only just broke the tape | 24 |
| Only making the grade? | 22 |
| Only monosyllabic state | 23 |
| Only occupant of Vostok I | 25 |
| Only one-syllable state | 23 |
| Only one-syllable state name | 28 |
| Only openings for air? | 22 |
| Only Pacific island monarchy | 28 |
| Only part of Egypt in Asia | 26 |
| Only pope from England | 22 |
| Only pres. born in Missouri | 27 |
| Only president born in Hawaii | 29 |
| Only remaining heater? | 22 |
| Only son of Czar Nicholas II | 28 |
| Only South Dakota-born VP | 25 |
| Only state with homonyms | 24 |
| Only tavern in Springfield | 26 |
| Only this, and nothing else | 27 |
| Only three-letter element | 25 |
| Only U.S. pres. to resign | 25 |
| Only Veep from Maryland | 23 |
| Only wants for sex, say | 23 |
| Only Welsh-born Batman | 22 |
| Only what a person can take? | 28 |
| Only with for the money, say | 28 |
| Only woman to outwit Holmes | 27 |
| Only women understand one | 25 |
| Onomastician's study | 24 |
| Onomasticon's contents | 26 |
| Onomatopoeically named legume | 29 |
| Onomatopoetic water sound | 25 |
| Onset of enthusiasm, perhaps | 28 |
| Onslaught of cold weather | 25 |
| Onstage thought balloon | 23 |
| Onstage thought bubble | 22 |
| Ontario Canadian Forces Base | 28 |
| Ontario Freeway, colloquially | 29 |
| Ontario heritage river | 22 |
| Ontario or Supérieur | 23 |
| Ontario Park, Fort ______ | 26 |
| Ontario politician Bob ___ | 26 |
| Ontario Premier George | 22 |
| Ontario Premier Leslie | 22 |
| Ontario Premier, formerly | 25 |
| Ontario river to James Bay | 26 |
| Ontario's 21st premier | 26 |
| Ontario's 23rd Premier | 26 |
| Ontario's Fort ___ | 22 |
| Ontario's Little _____ | 26 |
| Ontario's Michelle ______ | 29 |
| Ontario's neighbor | 22 |
| Ontario's official bird | 27 |
| Ontario's Old ___ William | 29 |
| Ontario's Premier David | 27 |
| Ontario's Premier Ernie | 27 |
| Ontario's provincial bird | 29 |
| Ontario's Red _____ | 23 |
| Ontario's Sault ___ Marie | 29 |
| Ontario's Shania ____ | 25 |
| Ontario's __ Tower | 22 |
| Ontario's ___ Canal | 23 |
| Ontario's ___ Canals | 24 |
| Ontario's ___ Locks | 23 |
| Ontario's ____ Hill | 23 |
| Ontario's ____ locks | 24 |
| Ontario's ____Centre | 24 |
| Ontario's _____ Carl Roy | 29 |
| Ontario's _____ Dick | 24 |
| Ontario's _____ Hill | 24 |
| Ontario's _____ Lake | 24 |
| Ontario's _____Bernardo | 27 |
| Ontario's _____Demeter | 26 |
| Ontario's ______ Canal | 27 |
| Ontario's ______canal | 25 |
| Ontario-born hockey legend | 26 |