TronSR:
Can, you "clear" x by x pixels, not the entire display?
It is probably possible, see in the library you are using (since you don't want to tell us what you are using...) there is probably a function setPixelColor or something like that, use it in combination with setCursor and for loops and you have your own function ClearRectangle( x1, y1, x2, y2 )