The most common and most likely answer to this crossword clue is the 10 letter word DIGRESSION
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More clues leading to the result DIGRESSION
Buddy explains!
The straight part
We know that "going off topic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case going off topic = digression.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 DIGRESSION mean?
DIGRESSION noun- An aside, an act of straying from the main subject in speech or writing.
- The act of straying from the main subject in speech or writing, particularly for rhetorical effect.
- A deviancy, a sin or error, an act of straying from the path of righteousness or a general rule.
- A deviation, an act of straying from a path.
- An elongation, a deflection or deviation from a mean position or expected path.