| Opens, as an aspirin bottle | 27 |
| Opens, as documents | 19 |
| Opens, as envelopes | 19 |
| Opens, as some jackets | 22 |
| Opens, as wine | 14 |
| Opens, e.g. | 11 |
| Opens, in a way | 15 |
| Openwork appearance | 19 |
| Openwork barrier | 16 |
| Openwork fabric | 15 |
| Opera | 5 |
| Opera piece | 12 |
| Opera "Moses und ___" | 31 |
| Opera "The Golden ---" | 32 |
| Opera "The Tale of ___ Saltan" | 40 |
| Opera ... coloratura ... "Eri tu" | 43 |
| Opera ... wine ... boot | 23 |
| Opera about a diva | 18 |
| Opera about a hunchbacked jester | 32 |
| Opera about an enslaved Ethiopian girl | 38 |
| Opera about an Ethiopian slave girl | 35 |
| Opera about an opera singer | 27 |
| Opera about spellbinding stairs? | 32 |
| Opera about the life of Lincoln | 31 |
| Opera about the steadfast wife of a political prisoner | 54 |
| Opera alternative? | 18 |
| Opera and Chrome, for two | 25 |
| Opera annoyance? | 16 |
| Opera based on a Beaumarchais comedy | 36 |
| Opera based on a Greek legend | 29 |
| Opera based on a play by Pierre Beaumarchais, with "The" | 66 |
| Opera based on a Shakespeare play | 33 |
| Opera based on Greek legend | 27 |
| Opera based on two Wedekind plays | 33 |
| Opera based on Victor Hugo's "Le roi s'amuse" | 63 |
| Opera bass Jerome ___ | 21 |
| Opera bit | 9 |
| Opera bit-role, in a way | 24 |
| Opera book | 10 |
| Opera box | 9 |
| Opera boy with 'night visitors' | 39 |
| Opera buff's subject | 24 |
| Opera by Cherubini | 18 |
| Opera by d'Erlanger | 23 |
| Opera by Delibes | 16 |
| Opera by Donizetti | 18 |
| Opera by Giordano | 17 |
| Opera by Glinka | 15 |
| Opera by H. Parker | 18 |
| Opera by Halévy | 18 |
| Opera by Handel | 15 |
| Opera by Handel: 1738 | 21 |
| Opera by Horatio Parker | 23 |
| Opera by Humperdinck | 20 |
| Opera by Karl Goldmark | 22 |
| Opera by Kienzl: 1898 | 21 |
| Opera by Massenet | 17 |
| Opera by Puccini | 16 |
| Opera by R. Strauss | 19 |
| Opera by Rossini or Verdi | 25 |
| Opera by Salieri | 16 |
| Opera by Strauss | 16 |
| Opera by Thomas | 15 |
| Opera by today's birthday composer | 38 |
| Opera by Verdi | 14 |
| Opera by Verdi: 1871 | 20 |
| Opera by Von Weber | 18 |
| Opera by Wagner: 1856 | 21 |
| Opera by Weber | 14 |
| Opera call | 10 |
| Opera cape | 10 |
| Opera cast members | 18 |
| Opera CD track | 14 |
| Opera celeb | 11 |
| Opera character who commits suicide by jumping off a parapet | 60 |
| Opera character who cries "Il fazzoletto!" ("The handkerchief!") | 84 |
| Opera character who jumps to her death in the end | 49 |
| Opera character who sees the words "Abandon hope, all ye who enter here" | 82 |
| Opera character who sings "Eri tu" | 44 |
| Opera character who sings "Largo al factotum" | 55 |
| Opera character who sings “Vissi d’arte” | 52 |
| Opera character with a dream | 28 |
| Opera cheer | 11 |
| Opera cheers | 12 |
| Opera chorus weapon | 19 |
| Opera circle | 12 |
| Opera commissioned by the khedive of Egypt | 42 |
| Opera company with muscle | 25 |
| Opera composer | 14 |
| Opera composer Alban | 20 |
| Opera composer Nikolai | 22 |
| Opera composer?Donizetti's teacher | 38 |
| Opera conductor Alberto | 23 |
| Opera conductor Daniel | 22 |
| Opera conductor Daniel ___ | 26 |
| Opera cry | 9 |
| Opera cycle | 11 |
| Opera debut of 1900 | 19 |
| Opera director Capobianco | 25 |
| Opera director Scotto | 21 |