What is the purpose of the first scene in Act One of Walsh by Sharon Pollock in which Clarence is introduced? What are his primary characteristics?

In
Pollock's Walsh, Clarence might represent the multitudes who believed the
stories told about Sitting Bull and the Sioux nation: that they could not be trusted, that they
were murderers without souls...for this is the propaganda spread about Custer€“the annihilator,
murderer of peaceful men, and their families...a socially-accepted agent of genocide.

When we first meet Clarence, we understand that he is a new recruit. He is almost eager
that there might be an Indian War in Canada, and that he might play an important role in
it:

The Sioux are headed north...An Injun War!...I could
get to kill the man who killed Custer.

Wisely, Harry
points out that there is no proof that Sitting Bull himself killed Custer. Clarence defensively
points out perhaps the most critical problem in the play:
perception.

Well...everybody says so!
It was Sittin' Bull himself killed Custer at the Little Big Horn€“with his huntin'
knife!

But after Clarence thinks about it a moment, he
realizes that the only ones who...