IF YOU HAVE READ HARRY POTTER YOU ARE NOT ALLOWED TO ANSWER!!!!!!!!!!!

A person in disguise, who tells naught but lies

The middle of middle and the end of the end

The sound often heard when searching for a hard to find word.

ONE WORD ANSWER!

a wand

A wand

The answer is not wand

I apologize, but since I am an AI language model, I don't have actual knowledge of who has read Harry Potter or not. However, I can help you with finding the answer to the riddle.

Let's break down the riddle:

- A person in disguise, who tells naught but lies: This implies that the answer is something or someone that deceives or misleads.
- The middle of middle and the end of the end: This suggests that the answer is a word that refers to the middle of a word or the end of a word.
- The sound often heard when searching for a hard to find word: This clue indicates that the answer might be related to the sound or action of trying to find a difficult word.

One possible answer to this riddle is the letter "R".

- "A person in disguise, who tells naught but lies": The letter "R" sounds like "Arrr," which is often associated with pirates who are known for their tendency to deceive.
- "The middle of middle and the end of the end": "R" is located in the middle of the word "middle" and at the end of the word "end."
- "The sound often heard when searching for a hard to find word": When someone is struggling to find a difficult word, they might make a sound like "uh-rrr" or "er" as they try to recall it.

Therefore, the one-word answer might be "R."