Prince of Spires
Istar
I just realised this means that in the southern hemisphere they're actually reversed, so deosil would be counterclockwise...Deosil and widdershins mean with and against the direction of the sun, respectively. Same kind of concept. Clockwise and counterclockwise mean the same thing because a clock face is designed in imitation of a sundial, which naturally follows the sun's direction from east to west.
The funny thing is that it doesn't actually matter if the user knows exactly what the word means, unless that's 100% needed for the story. As long as it's clear from the context that it means a direction in which something turns, then the user will pick up on it and file it away as "local word which means it moves", which can add flavor to your worldbuilding. Of course, if it's important to the plot that something moves in a clockwise manner, as opposed to it just moves in a direction, then you need to explain it to the reader. Otherwise it's fine if the reader just knows it moves.