Dot pretends to be a Russian race car driver and Miss Fisher introduces her be the name Cecil cooked up for her, "Valentina Ranamelova". The joke here is that the surname sounds like "ran-'em-all-over", a funny name for a race car driver. This is why in the previous scene, when they are falsifying the credentials, Cecil says he's got 'a beauty of a name' for her documents.
This is the first time The Adventuress Club is seen; it is the cornerstone of Ms Fisher's Modern Murder Mysteries.