There is a total of 6420 clues beginning with op
- Opening for peering through a fence
- Opening for pouring molten metal in foundaries
- Opening for recorded music
- Opening for Romeo
- Opening for Romeo?
- Opening for sweat
- Opening for the despondent
- Opening for the wrist or the back?
- Opening for troops?
- Opening for valence
- Opening for Vegas
- Opening for while
- Opening for winter fishing
- Opening foray
- Opening four
- Opening foursome
- Opening frames
- Opening gambit of sorts
- Opening game of sports season
- Opening game time
- Opening games: Slang
- Opening golf shot
- Opening group?
- Opening gun
- Opening half?
- Opening hand
- Opening Hebrew letter
- Opening hymn words
- Opening in "Hollywood Squares"
- Opening in "Hollywood Squares," essentially
- Opening in a battlement
- Opening in a dentist's schedule?
- Opening in a door for mail
- Opening in a football helmet
- Opening in a game
- Opening in a helmet
- Opening in a leaf
- Opening in a pet carrier
- Opening in a popular song for kindergartners
- Opening in a schedule
- Opening in a ship's deck
- Opening in a ship's side
- Opening in a sponge
- Opening in a sweater?
- Opening in a violin
- Opening in an animal carrier
- Opening in cosmetology?
- Opening in some pajamas
- Opening in some pajamas, once
- Opening in the casino industry?
- Opening in the computer business?
- Opening in the head
- Opening in the ice
- Opening in the Mideast?
- Opening in the Navy?
- Opening in the North Pole?
- Opening in the sewer system?
- Opening in the skin
- Opening in the skull
- Opening in the theater, maybe
- Opening in Vegas
- Opening in Vegas?
- Opening in wastewater management?
- Opening installment of a series
- Opening kickoff, say, and what both parts of 17-, 30- and 47-Across can be
- Opening lead of a singleton, at bridge
- Opening lead of a singleton, in bridge
- Opening lead of a singleton
- Opening letters
- Opening letters?
- Opening line
- Opening line from a TV show that debuted on 1/5/61
- Opening line from someone phoning home
- Opening line of a 1966 #1 Beatles hit
- Opening line of Simon & Garfunkel's 'The Boxer' (or an alternate title for this puzzle?)
- Opening line, continued
- Opening line?
- Opening lines
- Opening lines of a drama
- Opening lines, for short
- Opening lines?
- Opening lyric of 118-Across
- Opening lyrics of "Misty"
- Opening lyrics of a children's tune
- Opening made by a letter opener
- Opening made by splitting
- Opening maneuver
- Opening maneuver to gain advantage
- Opening matter
- Opening minutes of "Saving Private Ryan"
- Opening monologue, for short
- Opening move
- Opening move in chess
- Opening move
- Opening movement of Holst's "The Planets"
- Opening moves
- Opening musical bars, for short
- Opening musical passage
- Opening name on Wall Street
- Opening necessity?