All planets revolve around the sun in the same direction. This direction is counterclockwise, if viewed from above. However, Venus rotates around its own axis (spins) very slowly in a clockwise direction, which is the opposite direction of the other planets.
The competing theories for the cause of this reverse rotation are 1) tidal effects of the Sun and 2) an impact with a large asteroid in the distant past. While the thick atmosphere of Venus could indeed create tidal effects, these are not seen in the gas giants. A collision in the past, similar to an impact that is thought to have formed Earth's Moon, is the more likely current theory.
In any event, the rotation is so slow that Venus can be said to be barely rotating at all. So, in that respect, Venus is only barely rotating clockwise. It takes 243 days to make one turn, which is longer than its year of about 225 Earth days. (The combination creates an effective solar day of about 117 Earth days in length.)