Lewis structure of CN radical I need to draw the Lewis formula for $\ce{CN}$. However, I am not sure how to draw the single free electron.
My idea would be as follows:

$$\Large\ce{\llap{·}C#N\rlap{:}}$$

Does that make sense?
You drew the radical, which is in normal cases very unstable.
The cyanide ion has an ion pair instead of the single electron at the carbon atom.