There is a total of 6421 clues beginning with op
- Opera heroes
- Opera heroine
- Opera heroine who is an opera singer
- Opera heroine who sings "Einsam in trüben Tagen"
- Opera heroine who slays a witch
- Opera heroine with the aria "Einsam in trüben Tagen"
- Opera heroine, often
- Opera heroine, usually
- Opera heroine, usually
- Opera heroine
- Opera heroines, often
- Opera heros, often
- Opera high spot
- Opera highlight
- Opera highlight, perhaps
- Opera highlight
- Opera highlights
- Opera house accommodation
- Opera house area
- Opera house at Milan (with "La")
- Opera house attire
- Opera house attire, perhaps
- Opera house box
- Opera house box
- Opera house boxes
- Opera house cheer
- Opera house cheers
- Opera house cries
- Opera house garb
- Opera house highlight
- Opera house in Milan
- Opera house La __
- Opera house La ___
- Opera house level
- Opera house seating section
- Opera house section
- Opera house shout
- Opera house solo
- Opera house song
- Opera house that opened with "Faust" in 1883
- Opera house
- Opera immortal
- Opera impresario Caldwell
- Opera impresario
- Opera in which "Bell Song" is sung
- Opera in which Grace Bumbry debuted
- Opera in which Jack the Ripper is a character
- Opera in which Luciano Pavarotti gave his final Met performances
- Opera including "Home Sweet Home"
- Opera including "Song of India”
- Opera ingredient
- Opera interrupter of note
- Opera introduction
- Opera laid in Africa
- Opera language?
- Opera lass who broke a vow
- Opera legend Callas
- Opera legend who was close to Onassis
- Opera libretto
- Opera libretto listing
- Opera locations
- Opera lover, perhaps
- Opera made into a Broadway musical with an Elton John/Tim Rice score
- Opera mecca
- Opera melody
- Opera name
- Opera name
- Opera notables
- Opera number
- Opera number (11)
- Opera number for one
- Opera numbers
- Opera of 1844
- Opera of 1871
- Opera of 1900 set in 1800
- Opera of a certain price
- Opera of note
- Opera of Ping, Pong, and Pang
- Opera offering
- Opera offerings
- Opera often paired with "Cavalleria Rusticana"
- Opera on which "Rent" is based
- Opera on which "Rent" was based
- Opera opener
- Opera opener, often
- Opera opening
- Opera opus
- Opera or ballet part
- Opera or concert attachment
- Opera or concert conclusion?
- Opera or hard
- Opera originally titled "Violetta"
- Opera outburst
- Opera output
- Opera ovation
- Opera overture
- Opera part
- Opera part, in Orly
- Opera part
- Opera part: It