| Inst. in the smallest state | 27 |
| Inst. like Northeastern | 23 |
| Inst. near Olean, N.Y. | 22 |
| Inst. of higher education | 25 |
| Inst. of higher learning | 24 |
| Inst. that includes C.W. Post | 29 |
| Instagram account creator | 25 |
| Instagram effect, sometimes | 27 |
| Instagram page, essentially | 27 |
| Instagram upload, informally | 28 |
| Instagram uploads, informally | 29 |
| Install before November, say | 28 |
| Install fiberglass, perhaps | 27 |
| Install needed equipment | 24 |
| Install to new specifications | 29 |
| Install wallpaper, say | 22 |
| Install, as a minister | 22 |
| Install, as floor tiles | 23 |
| Install, as new shoelaces | 25 |
| Installation artist Sudbrack | 28 |
| Installation need, often | 24 |
| Installed anew as a carpet, | 27 |
| Installed anew, as flooring | 27 |
| Installed the shish kebab | 25 |
| Installed, as a carpet | 22 |
| Installed, as a cornerstone | 27 |
| Installer's need, often | 27 |
| Installing ceramic squares | 26 |
| Installment forerunner | 22 |
| Installment plan of a sort | 26 |
| Installs a ready-made lawn | 26 |
| Installs new thatch on, maybe | 29 |
| Installs, as a driveway | 23 |
| Installs, as a minister | 23 |
| Installs, as an outfield | 24 |
| Installs, as carpeting | 22 |
| Installs, as paintings | 22 |
| Instance of backsliding | 23 |
| Instance of unfairness | 22 |
| Instance of zoning out | 22 |
| Instance, for example (abbr.) | 29 |
| Instance, in Évreux | 23 |
| Instance, in St.-Lô | 22 |
| Instant correspondence | 22 |
| Instant messaging for Macs | 26 |
| Instant messaging pioneer | 25 |
| Instant Messenger user | 22 |
| Instant oatmeal direction | 25 |
| Instant of realization | 22 |
| Instant replay provider | 23 |
| Instant replay viewers | 22 |
| Instant replay watcher | 22 |
| Instant, in product names | 25 |
| Instant-messaging pioneer | 25 |
| Instant-replay feature | 22 |
| Instant-replay technique | 24 |
| Instantly, so it's said | 27 |
| Instep coverer, at times | 24 |
| Instigator's phrase | 23 |
| Instill with compassion | 23 |
| Instiller of confidence | 23 |
| Instinct body spray brand | 25 |
| Instinctive feeling, slangily | 29 |
| Instinctive, as a feeling | 25 |
| Instinctive, as a reaction | 26 |
| Instincts sometimes indulged | 28 |
| Institute in Baltimore | 22 |
| Institute of Medicine std. | 26 |
| Institute, e.g.: Abbr. | 22 |
| Institutes legal action | 23 |
| Instituteur's institution | 29 |
| Instituteur's place | 23 |
| Institution at Reading | 22 |
| Institution founded in 1440 | 27 |
| Institution founded in 1701 | 27 |
| Institution in Ithaca, N.Y. | 27 |
| Institution on the Thames | 25 |
| Institution since 1701 | 22 |
| Institution's agent | 23 |
| Institutional investment | 24 |
| Instruction #1 for roofers? | 27 |
| Instruction at a horse show | 27 |
| Instruction at many a corner | 28 |
| Instruction book genre | 22 |
| Instruction book segment | 24 |
| Instruction for a user | 22 |
| Instruction for a violinist | 27 |
| Instruction for an alley cat? | 29 |
| Instruction for casual dress | 28 |
| Instruction for murder? | 23 |
| Instruction for the chef | 24 |
| Instruction for this puzzle | 27 |
| Instruction manual beginning | 28 |
| Instruction manual entry | 24 |
| Instruction manual segments | 27 |
| Instruction manual, perhaps | 27 |
| Instruction next to an X | 24 |
| Instruction on a jukebox | 24 |
| Instruction sheet start | 23 |
| Instruction to a boxer | 22 |