Best understanding of gravity that exists today is it's a warping of space and time around a massive object that causes objects moving around it to deviate from straight line motion when seen from an observer far away. Not sure how you could massage that into an Aristotelian explanation. I'm also not an expert of Aristotelian physics, which is why I left it at that, but one of the consequences I understand from it was that heavier objects should fall faster than lighter ones, which is the thing Galileo disproved.