Dill's career choice as a clown stems from the unhappiness he has experienced and witnessed. Dill decides he wants to be a clown because clowns are always happy--always laughing at the audience and making other people smile and feel good. Dill has experienced much heartache with his new family situation and he witnessed the injustice of the Tom Robinson trial that he just wants to find a safe, happy place where evil can't find him.
If Dill truly became a clown, I don't think he'd stick with it for very long. If Dill is as emotional as he's portrayed to be, he would find there is unhappiness wherever he goes. He would also struggle with putting aside that unhappiness to do his job--be a clown and make others and himself laugh.
Dill career choice to be a new kind of clown is showing a great sign of maturity. Dill says he wants to be a clown that laughs at people instead of people laughing at him. This means that Dill wants to laugh at people (society) because they are being so dumb in the Tom Robinson court case.
Dill wants to be a clown because they laugh all the time. When he sees the harsh reality of the town and the idiocy they are portraying at the Tom Robinson case, he wants to laugh through it and laugh at the people who have this type of thinking.
DILL IS AFRAID OF GROWING UP AND BECOMING AN ADULT SO IN ORDER TO STAY AS A CHILD A CLOWN WOULD BE THE PERFECT JOB