Drinking glass
Else clues• ... kind of circus performer?
• Glass
• Glass of a sort
• Pigeon that executes backward somersaults in flight or on the ground
• A gymnast who performs rolls and somersaults and twists etc.
• A glass with a flat bottom but no handle or stem
• Originally had a round bottom
• A movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown