How to get screen to clear?

[mzmingle]

Hi, I'm confused again! I'm trying to code it so that when they click a button, it moves to a new screen. However, at the moment, it only goes to the cleared screen as long as i keep hold of the mouse button - how do I get it to stay after it's been clicked?

I know this is probably really obvious, but it won't work for me haha!

    if event.type == pygame.MOUSEBUTTONDOWN:
        mouse = pygame.mouse.get_pos()
        if student.collidepoint(mouse):
            screen.fill(WHITE)