| Perk up a straightedge | 22 |
| Perk recipients, usually | 24 |
| Perk for a pool party? | 22 |
| Perk for a C.E.O., maybe | 24 |
| Perjury and piracy, for two | 27 |
| Perjurers' statements | 25 |
| Perjurer's predilection | 27 |
| Perjurer's offense | 22 |
| Perjurer's confession | 25 |
| Perjurer's admission | 24 |
| Peritonitis cause, perhaps | 26 |
| Perishables for Jan. 1 | 22 |
| Perishable fashion accessory | 28 |
| Periscope's source | 22 |
| Peripheral-vision thwarters | 27 |
| Peripheral plug-in places | 25 |
| Peripheral basilica feature | 27 |
| Peripatetic religious leader | 28 |
| Peripatetic football team | 25 |
| Periods worth remembering | 25 |
| Periods when many go to lunch | 29 |
| Periods preceding big events | 28 |
| Periods of time: Abbr. | 22 |
| Periods of the academic year | 28 |
| Periods of revolution? | 22 |
| Periods of rain, often | 22 |
| Periods of powerlessness | 24 |
| Periods of pious seclusion | 26 |
| Periods of milit. service | 25 |
| Periods of intense pressure | 27 |
| Periods of historical note | 26 |
| Periods of highest vigor | 24 |
| Periods of great success | 24 |
| Periods of good fortune | 23 |
| Periods of extra mins. | 22 |
| Periods of duty at sea | 22 |
| Periods of distinction | 22 |
| Periods of development | 22 |
| Periods just past sunset | 24 |
| Periods just past midnight | 26 |
| Periods in prison, e.g. | 23 |
| Periods immediately before | 26 |
| Periods for geologists | 22 |
| Periods for Aries and Taurus | 28 |
| Periodontists' org. | 23 |
| Periodontists' grp. | 23 |
| Periodontist's org. | 23 |
| Periodontist's grp. | 23 |
| Periodontist's focus | 24 |
| Periodontist's deg. | 23 |
| Periodontist's concerns | 27 |
| Periodontist's concern | 26 |
| Periodonist's concern | 25 |
| Periodicals, for short | 22 |
| Periodical, informally | 22 |
| Periodical table abbr. | 22 |
| Periodical output: Abbr. | 24 |
| Periodical opinion piece | 24 |
| Periodical of haute couture | 27 |
| Periodical changers: Abbr. | 26 |
| Periodical accessed by a URL | 28 |
| Periodic-table listing: Abbr. | 29 |
| Periodic-table listing | 22 |
| Periodic-table entries | 22 |
| Periodic-table component | 24 |
| Periodic White House event | 26 |
| Periodic weather disruption | 27 |
| Periodic table's no. 10 | 27 |
| Periodic table period? | 22 |
| Periodic table listings | 23 |
| Periodic table listing | 22 |
| Periodic table info: Abbr. | 26 |
| Periodic table entry (Abbr.) | 28 |
| Periodic table developer | 24 |
| Periodic table datum, briefly | 29 |
| Periodic produce outbreak | 25 |
| Periodic Pacific disruption | 27 |
| Periodic income, in Paris | 25 |
| Periodic Halloween sight? | 25 |
| Periodic growth, as funds | 25 |
| Periodic dairy aisle offering | 29 |
| Periodic chart data: abbr. | 26 |
| Periodic activity of snakes | 27 |
| Periodi-cal, for short | 22 |
| Period, in Web addresses | 24 |
| Period with nothing to do | 25 |
| Period with little rainfall | 27 |
| Period when things go poorly | 28 |
| Period too long to measure | 26 |
| Period to find out more | 23 |
| Period that unifies calendars | 29 |
| Period that appears endless | 27 |
| Period of watchfulness | 22 |
| Period of watchful attention | 28 |
| Period of unbridled activity | 28 |
| Period of time, in astronomy | 28 |
| Period of time in Spain | 23 |
| Period of the first dinosaurs | 29 |
| Period of the Crusades | 22 |
| Period of the Cenozoic Era | 26 |