| Principal McGee portrayer in the "Grease" films | 57 |
| Principal McGee's portrayer in "Grease" | 53 |
| Principal movie roles | 21 |
| Principal Norse gods | 20 |
| Principal of Chinese philosophy | 31 |
| Principal ore of aluminum | 25 |
| Principal ore of lead | 21 |
| Principal part | 14 |
| Principal part of a country | 27 |
| Principal pipe | 14 |
| Principal pipes | 15 |
| Principal plant? | 16 |
| Principal player in "Grease" | 38 |
| Principal port of Denmark | 25 |
| Principal port of Syria | 23 |
| Principal portrayer in "Grease" | 41 |
| Principal Prince Edward Island crop | 36 |
| Principal principle | 19 |
| Principal principles | 20 |
| Principal rail route | 20 |
| Principal railroad routes | 25 |
| Principal raw material | 22 |
| Principal residences | 20 |
| Principal river of Armenia | 26 |
| Principal role | 14 |
| Principal roles | 15 |
| Principal seaport of Chile | 26 |
| Principal site? (abbr.) | 23 |
| Principal Skinner hire | 22 |
| Principal Skinner of "The Simpsons" | 45 |
| Principal Skinner on "The Simpsons" | 45 |
| Principal sleeping quarters | 27 |
| Principal source of lead | 24 |
| Principal street | 16 |
| Principal supply | 16 |
| Principal support | 17 |
| Principal tonality, as of a concerto | 36 |
| Principal trend | 15 |
| Principal tributary of the Ohio River | 37 |
| Principal's charge: Abbr. | 29 |
| Principal's cousin | 22 |
| Principal's gp. | 19 |
| Principal's kin | 19 |
| Principal: Prefix | 17 |
| Principality in the Pyrenees | 28 |
| Principality ruled by the House of Grimaldi | 43 |
| Principally | 11 |
| Principals | 10 |
| Principals with principles | 26 |
| Principe's sister island | 28 |
| Principle | 9 |
| Principle for Erasmus | 21 |
| Principle governing play, as in golf | 36 |
| Principle in shingling | 22 |
| Principle involving the temperature and density of gases | 56 |
| Principle mass of a tooth | 25 |
| Principle of capitalism | 23 |
| Principle of conservation | 25 |
| Principle of economy | 20 |
| Principle of faith | 18 |
| Principle of good conduct | 25 |
| Principle of Martin Luther King Jr. | 35 |
| Principle of minimized hypotheses | 33 |
| Principle of philosophy | 23 |
| Principle of Puzo prose | 23 |
| Principle of right | 18 |
| Principle of royal supremacy | 28 |
| Principle or belief | 19 |
| Principle represented by the yin and yang | 41 |
| Principle that hinders action | 29 |
| Principle that means "path" | 37 |
| Principle that reads the same forward and backward | 50 |
| Principle that the simplest explanation is usually the correct one | 66 |
| Principled | 10 |
| Principles | 10 |
| Principles espoused during Women's History Month? | 53 |
| Principles of artistic beauty | 29 |
| Principles of faith | 19 |
| Principles of game play | 23 |
| Principles of physics | 21 |
| Principles, as in a contest | 27 |
| Principles: Abbr. | 17 |
| Pringle, e.g. | 13 |
| Pringles alternative | 20 |
| Pringles alternatives | 21 |
| Pringles competitor | 19 |
| Pringles container | 18 |
| Pringles Light ingredient | 25 |
| Pringles rival | 14 |
| Pringles-like Lay's product | 31 |
| Prink | 5 |
| Prinsengracht Canal site | 24 |
| Print | 5 |
| Print (or reprint) of a book | 28 |
| Print again | 11 |
| Print and radio, e.g. | 21 |
| Print anew | 10 |
| Print below the text | 20 |
| Print casualty of 2012 | 22 |
| Print choices | 13 |