The most common and most likely answer to this crossword clue is the 10 letter word PERVERSION
I've seen this crossword clue in The Daily Telegraph
P
E
R
V
E
R
S
I
O
N
More clues leading to the result PERVERSION
Buddy explains!

The straight part
We know that "Distortion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case distortion = perversion.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 PERVERSION mean?
PERVERSION noun- The action of perverting someone or something; humiliation; debasement.
- The state of being perverted; depravity; vice.
- A sexual practice considered abnormal; sexual deviance.
- Tendril perversion.