Answer:
Based on this excerpt, Wright feels about his final boyhood encounter with his father as if he had unfinished business
Explanation:
The expression I had the feeling that I had had to do with something unclean is the one that gives the principal idea of that feeling of unfinished business as well as the expression I would stare at it, feeling that it possessed some vital meaning which always eluded me here the character has the sensation that there's something there that he can fully understand and hopes to find the answer someday.