I'm not really familiar with the music of Eddie "the Chief" Clearwater, but I've often heard him described as a disciple of Chuck Berry. (I also saw one of his stage costumes hanging at the Delta Blues Museum in Clarksdale). I haven't found a video that shows him really sounding like Berry, but click here for a nice interview where he talks about Berry's influence. There's a nice story about the two of them appearing together at a suburban Chicago club and Chuck telling him to play "Johnny B. Goode."
And here he is at work:
By the way, there are some nice videos of him in the 1970s that I'm not able to embed here. But you might want to look them up on youtube. A couple have him playing with Chuck Berry sidemen like Odie Payne.