The most common and most likely answer to this crossword clue is the 4 letter word ERRS
E
R
R
S
Buddy explains!
The straight part
We know that "makes mistakes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case makes mistakes = errs.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 ERRS mean?
ERRS verb- To make a mistake.
- To sin.
- To stray.