The most common and most likely answer to this crossword clue is the 3 letter word ERR
E
R
R
More clues leading to the result ERR
- English bishop finds sin
- Stray, right after hesitation
- Mistake taking rook with queen
- Make a mistake in bumper race
- Blunder as US hospital department shortened radius
- Go wrong or right, led by the Queen
- English bishop's sin
- Make mistake — Deirdre oddly ignored
- Expression of doubt about origin of “Rongo” — “go wrong”?
- Blunder, introducing Republican to Queen!
Buddy explains!

The straight part
We know that "go wrong" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case go wrong = err.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 ERR mean?
ERR verb- To make a mistake.
- To sin.
- To stray.