There is a total of 6421 clues beginning with op
- Opera based on two Wedekind plays
- Opera based on Victor Hugo's "Le roi s'amuse"
- Opera bass Jerome ___
- Opera basso
- Opera bit-role, in a way
- Opera bit
- Opera book
- Opera box
- Opera box
- Opera boxes
- Opera boxes
- Opera boy with 'night visitors'
- Opera break
- Opera by 13 Down
- Opera by 26 Down
- Opera by 39 across
- Opera by 39 across, with "The"
- Opera by 42 Across
- Opera by 48 Down
- Opera by 5 Down
- Opera by Bellini, 1831
- Opera by Bellini
- Opera by Berg
- Opera by Bizet
- Opera by Bizet, 1863
- Opera by Charpentier
- Opera by Cherubini
- Opera by Cherubini
- Opera by d'Erlanger
- Opera by Delibes
- Opera by Donizetti
- Opera by Donizetti
- Opera by Emily Dickinson
- Opera by Franz Genee (1823–95)
- Opera by Giordano
- Opera by Giuseppe Verdi
- Opera by Glinka
- Opera by Gluck
- Opera by H Parker
- Opera by Halévy
- Opera by Handel
- Opera by Handel
- Opera by Horatio Parker
- Opera by Horatio Parker
- Opera by Jacobowski
- Opera by Karl Goldmark
- Opera by Kienzl: 1898
- Opera by Mascagni
- Opera by Massenet
- Opera by Massenet, 1894
- Opera by Massenet
- Opera by Menotti
- Opera by Paderewski
- Opera by Puccini
- Opera by Puccini
- Opera by R Strauss
- Opera by Richard Strauss
- Opera by Rimski-Korsakov
- Opera by Rimsky-Korsakov
- Opera by Rossini or Verdi
- Opera by Saint-Saëns
- Opera by Salieri
- Opera by Strauss
- Opera by Strauss
- Opera by today's birthday composer
- Opera by Verdi
- Opera by Verdi, 1844
- Opera by Verdi, based on Hugo play
- Opera by Verdi
- Opera by Victor Herbert
- Opera by von Flotow
- Opera by von Weber
- Opera by Von Weber
- Opera by Wagner
- Opera by Wagner: 1856
- Opera by Weber
- Opera by Weber
- Opera call
- Opera cape
- Opera cape
- Opera cast members
- Opera celeb
- Opera center in Europe
- Opera center of Italy
- Opera character who commits suicide by jumping off a parapet
- Opera character who cries "Il fazzoletto!" ("The handkerchief!")
- Opera character who jumps to her death in the end
- Opera character who sees the words "Abandon hope, all ye who enter here"
- Opera character who sings "Eri tu"
- Opera character who sings "Largo al factotum"
- Opera character who sings "Vissi d'arte"
- Opera character with a dream
- Opera character
- Opera cheer
- Opera chorus weapon
- Opera circle
- Opera city of Italy
- Opera cloak
- Opera closer, maybe
- Opera commentator