There is a total of 6423 clues beginning with op
- Opium-derived narcotic
- Opium-yielding plant
- Opole's river
- Opole's river
- Oporto export
- Oporto greeting
- Oporto native, eg
- Oporto's river
- Oporto-to-Lisbon direção
- Opossum shrimp
- Opossum's branch grabber
- Opossum's cousin
- Opossum's grasping appendage
- Opossum's gripper
- Opossums' Australian cousins
- Opp
- Opp of "prescription"
- Opp of "take out"
- Opp of 29 Across
- Opp of 31 Across
- Opp of 52 Across
- Opp of 56-Down
- Opp of 6 Down
- Opp of a petitioner, in court
- Opp of accelerando
- Opp of ant
- Opp of antonym
- Opp of arrival
- Opp of day
- Opp of days
- Opp of Democrat
- Opp of dep
- Opp of depart
- Opp of departure
- Opp of down
- Opp of ETA
- Opp of expenditure
- Opp of express
- Opp of fem
- Opp of feminine
- Opp of fortis
- Opp of horizontal
- Opp of legato
- Opp of legato, in music
- Opp of local
- Opp of long
- Opp of longitude
- Opp of lv
- Opp of masc
- Opp of masculine
- Opp of max
- Opp of maximum
- Opp of neg
- Opp of NNE
- Opp of NNW
- Opp of opt
- Opp of outside
- Opp of plaintiff
- Opp of pos
- Opp Of ppp, musically
- Opp of ques
- Opp of sent
- Opp of sing
- Opp of SSW
- Opp of syn
- Opp of vert
- Opp of width
- Opp of windward
- Opp of withdrawal
- Opp of WNW
- Opp of WSW
- Opp WSW
- Oppenheim sleuth
- Oppenheimer colleague on the Manhattan Project
- Oppenheimer development
- Oppenheimer opposed it
- Oppenheimer or Urey
- Oppenheimer subject
- Oppenheimer's agcy
- Oppenheimer's alma mater
- Oppenheimer's creation, colloquially
- Oppenheimer's metier
- Oppenheimer's org
- Oppenheimer's subject
- Oppidan
- Oppidan school
- Oppidan's locale
- Oppidan
- Opponent
- Opponent for 4-Down
- Opponent for Andre
- Opponent for Bjorn
- Opponent for Bjorn or Vitas
- Opponent for Connors
- Opponent for Dempsey
- Opponent for Ike
- Opponent for Juan Belmonte
- Opponent for Laver
- Opponent for Louis
- Opponent for Mandlikova