Is there a Gaelic version of widdershins?

Well, I don't have a Scottish Gaelic dictionary, but there is a term in Irish (Gaelic): tuathal 'direction against the sun, wrong direction'; dul tuathal 'to go against the direction of the sun, anti-clockwise'. Irish forms of the Scottish Gaelic term: deiseal 'righhand direction, direction of the sun' dul deiseal 'to follow the direction of the sun, to go clockwise. The left hand in Irish is cle and the right is deis; there's also an older form deas which also means 'south'. Tuath also means 'left' or 'north' in Old Irish.

So, I guess, a good word could be tuathal.