The most common and most likely answer to this crossword clue is the 3 letter word DIV
D
I
V
Buddy explains!
The straight part
We know that "Fool" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fool = div.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DIV mean?
DIV noun- A function, implemented in many programming languages, that returns the result of a division of two integers.
- A section of a web page, or the div element that represents it in HTML code.
- (Eton College, public school slang) A division; a lesson.
- A division.
- (vector calculus) Divergence; a kind of differential operator.
- Divinity, as a school subject.
- A foolish person; an idiot.
- A supernatural entity of disagreeable nature.