People in America pursue legal redress in hearing (5)
I believe the answer is:
sioux
'hearing' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for sioux that I've seen before include "N. American natives" , "Native American tribe" , "Native American from between Lake Michigan and the Rockies" , "Sitting Bull's people" , "Native Indian group" .)