| Pioneer's cap supplier | 26 |
| Pioneer video-game name | 23 |
| Pioneer video game systems | 26 |
| Pioneer TV personality | 22 |
| Pioneer transportation | 22 |
| Pioneer talk show host | 22 |
| Pioneer sci-fi man et al. | 25 |
| Pioneer reggae musician | 23 |
| Pioneer radiation researcher | 28 |
| Pioneer preservationist | 23 |
| Pioneer physicist Alessandro | 28 |
| Pioneer photojournalist | 23 |
| Pioneer performance artist | 26 |
| Pioneer of slapstick cinema | 27 |
| Pioneer of projectile physics | 29 |
| Pioneer of New Journalism | 25 |
| Pioneer of detective fiction | 28 |
| Pioneer of antiseptic surgery | 29 |
| Pioneer name in video games | 27 |
| Pioneer movie director | 22 |
| Pioneer in vaccination | 22 |
| Pioneer in the math of sudoku | 29 |
| Pioneer in synthesizers | 23 |
| Pioneer in smooth jazz | 22 |
| Pioneer in scholasticism | 24 |
| Pioneer in quantum theory | 25 |
| Pioneer in quadraphonic music | 29 |
| Pioneer in psychoanalysis | 25 |
| Pioneer in probability | 22 |
| Pioneer in number theory | 24 |
| Pioneer in New Criticism | 24 |
| Pioneer in mathematical logic | 29 |
| Pioneer in literary realism | 27 |
| Pioneer in late-night TV | 24 |
| Pioneer in instant messaging | 28 |
| Pioneer in I.Q. testing | 23 |
| Pioneer in fluid mechanics | 26 |
| Pioneer in electrodynamics | 26 |
| Pioneer in electricity | 22 |
| Pioneer in electrical science | 29 |
| Pioneer in calculus notation | 28 |
| Pioneer in bacteriology | 23 |
| Pioneer in 35mm cameras | 23 |
| Pioneer guitar producer Paul | 28 |
| Pioneer German automaker | 24 |
| Pioneer geneticist Gregor | 25 |
| Pioneer Expressionist James | 27 |
| Pioneer Day month, in Utah | 26 |
| Pioneer Day celebrants | 22 |
| Pioneer computer of 1946 | 24 |
| Pioneer cell phone co. | 22 |
| Pioneer building material | 25 |
| Pioneer brand of craft beer | 27 |
| Pioneer botanist Franz ___ | 26 |
| Pioneer bop vibist Jackson | 26 |
| Pioneer Boone, for short | 24 |
| Pioneer Boone, folksily | 23 |
| Pioneer Boone, familiarly | 25 |
| Pioneer Boone, briefly | 22 |
| Pioneer Boone's nickname | 28 |
| Pioneer bathyspherist William | 29 |
| Pioneer auto manufacturer | 25 |
| Pioneer aircraft designer | 25 |
| Pioneer 11 destination | 22 |
| Pioneer 10 or Voyager 1 | 23 |
| Pinza's birthplace | 22 |
| Pinza who played de Becque | 26 |
| Pinza and Chaliapin, for two | 28 |
| Pinwheel's noisy action | 27 |
| Pinup's pride, perhaps | 26 |
| Pinto, but not garbanzo | 23 |
| Pinto charger of horror lit | 27 |
| Pinta's sister ship | 23 |
| Pinta's sailing companion | 29 |
| Pinta and Santa Maria partner | 29 |
| Pinta and Santa Maria go-with | 29 |
| Pint-size collectible? | 22 |
| Pint, as compared to a quart | 28 |
| Pint that may be weisse | 23 |
| Pint contents, perhaps | 22 |
| Pint : quart :: -- :fortnight | 29 |
| Pinstriped player, informally | 29 |
| Pinstriped hot corner player | 28 |
| Pins or penny preceder | 22 |
| Pins on record players | 22 |
| Pins are stuck in them | 22 |
| Pins and needles' place | 27 |
| Pins and needles holder | 23 |
| Pins and needles are on it | 26 |
| Pinpoint, with "on" | 29 |
| Pinot ___ (dry red wine) | 24 |
| Pinot ___ (a table wine) | 24 |
| Pinot ___ (a red wine) | 22 |
| Pinot or film follower | 22 |
| Pinot --- (dry red wine) | 24 |
| Pinos or Pozos preceder | 23 |
| Pinocchio, with a long nose | 27 |
| Pinocchio, periodically | 23 |
| Pinocchio, notoriously | 22 |
| Pinocchio's wrongs | 22 |