There is a total of 19 clues beginning with o-
- O- -- ('The Good Earth' role)
- O- -- ('The Good Earth' wife)
- O-1 in the USN
- O-Cedar product
- O-line anchor
- O-O-O
- O-O-O part
- O-ring
- O-ring, eg
- O-ring, for example
- O-rings, eg
- O-shaped
- O-shaped breakfast cakes
- O-T connectors
- O-X game: var
- O-yard dash for a gaucho wearer?
- O-___ ("Kill Bill" role)
- O-___ Ishii (Lucy Liu's role in "Kill Bill")
- O-___-O (brand of sponge)