One of those from The Maze capsized in The Ouachita River (3)
I believe the answer is:
rat
'one of those from the maze' is the definition.
I can't judge whether this definition defines the answer.
'capsized in the ouachita river' is the wordplay.
'capsized' says the letters should be written in reverse.
'in' indicates the answer is hidden within the clue.
'tar' is hidden within 'ouachita river'.
'tar' reversed gives 'RAT'.
Can you help me to learn more?
(Other definitions for rat that I've seen before include "One deserting sinking ship" , "shopper" , "Abandon" , "Unpleasant character" , "Rodent - deserter" .)