Here's the breakdown:
* The Daughter: The film follows the life of a serial killer named Jack, who is responsible for a series of gruesome murders.
* The Mother: One of the victims is Jack's mother, whom he kills after she refuses to have sex with him and insults him.
* The Clowns: The film is told in a fragmented and surreal style, with Jack's actions being framed as artistic creations. There are scenes with clowns, but they don't directly tell Jack to kill his mother.
However, the film's ambiguity and disturbing nature likely contributed to your misremembering.
Important Note: This film is extremely graphic and disturbing, and it's important to be aware of its content before watching it.