Can you and how do you change the clip in an animator?

I’m working on a game in Unity with a team I put together. I am working on an attacking system and I was wondering how I could change or select the clip to play in the animator controller on the character. I know I could use the normal animation system, but I want the benefits of mecanim. Any advice would be very much appreciated.

The only way to change the clip is to create transition from the first clip (state in their terminology) to the second: Unity - Manual: Animation States.
Then you should create a boolean parameter as described here: Unity - Manual: Animation Parameters

I hope that I have interpreted your question right:-)